COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Additional Information (Detail)
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3 Months Ended |
12 Months Ended |
Dec. 31, 2020
USD ($)
shares
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Sep. 30, 2020
USD ($)
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Jun. 30, 2020
USD ($)
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Mar. 31, 2020
USD ($)
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Dec. 31, 2019
USD ($)
Employee
shares
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Sep. 30, 2019
USD ($)
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Jun. 30, 2019
USD ($)
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Mar. 31, 2019
USD ($)
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Dec. 31, 2020
USD ($)
shares
|
Dec. 31, 2019
USD ($)
Employee
$ / shares
shares
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Dec. 31, 2018
USD ($)
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Defined Benefit Plan Disclosure [Line Items] |
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Defined benefit plan net actuarial loss |
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$ (10,100,000,000)
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$ (8,000,000,000.0)
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Service cost discount rate |
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2.87%
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3.55%
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4.45%
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Number of covered persons | Employee |
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18,800
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18,800
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Lump Sum Pension Payments |
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$ 820,000,000
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Health care cost trends, initial annual rate increase |
6.50%
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6.50%
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Health care cost trends, an ultimate trend rate |
4.50%
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4.50%
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Employer contributions |
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$ 3,125,000,000
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$ 2,362,000,000
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$ 186,000,000
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Fair value of plan assets |
$ 54,881,000,000
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47,767,000,000
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54,881,000,000
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47,767,000,000
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Decreas in projected benefit obligation |
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900,000,000
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Change in unrecognized pension and postretirement benefit costs, net of tax |
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880,000,000
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1,129,000,000
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(272,000,000)
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Net Income |
$ (3,347,000,000)
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$ 1,957,000,000
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$ 1,768,000,000
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$ 965,000,000
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$ (106,000,000)
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$ 1,750,000,000
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$ 1,685,000,000
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$ 1,111,000,000
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$ 1,343,000,000
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$ 4,440,000,000
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4,791,000,000
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Common stock held in plan assets (in shares) | shares |
0
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0
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0
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0
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Pension and postretirement benefit expense |
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$ 7,125,000,000
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$ 3,141,000,000
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2,242,000,000
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Pension and postretirement benefit expense |
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7,125,000,000
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3,141,000,000
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2,242,000,000
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Private Equity and Real Estate | Other Investments [Member] |
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Defined Benefit Plan Disclosure [Line Items] |
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Unfunded commitments to limited partnerships |
$ 3,300,000,000
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3,300,000,000
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Pension Benefits |
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Defined Benefit Plan Disclosure [Line Items] |
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Accumulated benefit obligation for pension plans |
66,900,000,000
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$ 55,000,000,000.0
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66,900,000,000
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55,000,000,000.0
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Employer contributions |
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26,000,000
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27,000,000
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Postretirement Medical Benefits |
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Defined Benefit Plan Disclosure [Line Items] |
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Employer contributions |
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77,000,000
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82,000,000
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Postemployment Retirement Benefits |
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Defined Benefit Plan Disclosure [Line Items] |
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Accumulated benefit obligation for pension plans |
2,800,000,000
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2,600,000,000
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2,800,000,000
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2,600,000,000
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International Pension Benefits |
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Defined Benefit Plan Disclosure [Line Items] |
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Fair value of plan assets |
1,835,000,000
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1,558,000,000
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1,835,000,000
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1,558,000,000
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International Pension Benefits | Cash and Cash Equivalents [Member] |
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Defined Benefit Plan Disclosure [Line Items] |
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Fair value of plan assets |
$ 84,000,000
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$ 72,000,000
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84,000,000
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72,000,000
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International Pension Benefits | Pension Benefits |
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Defined Benefit Plan Disclosure [Line Items] |
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Defined benefit plan, curtailment |
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0
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0
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0
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Defined benefit plan net actuarial loss |
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$ (123,000,000)
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$ (213,000,000)
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Discount rate |
1.94%
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2.21%
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1.94%
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2.21%
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Projected benefit obligation, Projected Benefit Obligation Exceeds the Fair Value of the Plan Assets |
$ 845,000,000
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$ 1,319,000,000
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$ 845,000,000
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$ 1,319,000,000
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Pension obligations |
388,000,000
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377,000,000
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388,000,000
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377,000,000
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Fair value of plan assets |
$ 1,835,000,000
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$ 1,558,000,000
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$ 1,835,000,000
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1,558,000,000
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1,284,000,000
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Change in Assumptions for Defined Benefit Plans [Member] |
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Defined Benefit Plan Disclosure [Line Items] |
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Change in unrecognized pension and postretirement benefit costs, net of tax |
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810,000,000
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Net Income |
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$ 616,000,000
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Earnings Per Share, Basic and Diluted | $ / shares |
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$ 0.71
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Discounted Employee Stock Purchase Modified Plan [Member] |
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Defined Benefit Plan Disclosure [Line Items] |
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Share Based Compensation Arrangement By Share Based Payment Award Exercisable Price Percentage Of Closing Price Of Another Class Of Stock |
95.00%
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95.00%
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Employee Defined Contribution Plans [Member] |
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Defined Benefit Plan Disclosure [Line Items] |
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Contributions charged to expense |
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$ 139,000,000
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$ 130,000,000
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127,000,000
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Pension and postretirement benefit expense |
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84,000,000
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67,000,000
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28,000,000
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Pension and postretirement benefit expense |
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84,000,000
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67,000,000
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28,000,000
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Amended Employee Defined Contribution Plans |
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Defined Benefit Plan Disclosure [Line Items] |
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Defined Contribution Plan, Increase (Decrease), Cost |
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0
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0
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0
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Defined Contribution Plan, Increase (Decrease), Cost |
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0
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0
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0
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Defined Contribution Money Purchase Plans [Member] |
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Defined Benefit Plan Disclosure [Line Items] |
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Contributions charged to expense |
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107,000,000
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97,000,000
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$ 92,000,000
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Central States, South East & South West Areas Health and Welfare Fund | Pension Benefits |
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Defined Benefit Plan Disclosure [Line Items] |
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Defined benefit plan net actuarial loss |
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(2,300,000,000)
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$ (603,000,000)
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Multiemployer Plans, Withdrawal Obligation |
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6,100,000,000
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Increase in benefit obligation |
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2,300,000,000
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Pension obligations |
$ 5,500,000,000
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$ 5,500,000,000
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Minimum |
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Defined Benefit Plan Disclosure [Line Items] |
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Duration for unfunded commitments to be contributed |
3 years
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3 years
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Minimum | Private Equity and Real Estate | Other Investments [Member] |
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Defined Benefit Plan Disclosure [Line Items] |
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Redemption notice period, lower limit |
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10 years
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Minimum | U.S. Pension Benefits |
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Defined Benefit Plan Disclosure [Line Items] |
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Postretirement medical plans service minimum eligibility year |
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10 years
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Postretirement medical plans service minimum eligibility age |
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55 years
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Minimum | International Pension Benefits | Cash and Cash Equivalents [Member] |
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Defined Benefit Plan Disclosure [Line Items] |
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Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) |
1.00%
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1.00%
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1.00%
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1.00%
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Minimum | Employee Defined Contribution Plans [Member] |
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Defined Benefit Plan Disclosure [Line Items] |
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Defined contribution plan, employer contribution (percentage) |
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3.00%
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Minimum | Amended Employee Defined Contribution Plans |
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Defined Benefit Plan Disclosure [Line Items] |
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Defined contribution plan, employer contribution (percentage) |
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5.00%
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Maximum |
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Defined Benefit Plan Disclosure [Line Items] |
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Duration for unfunded commitments to be contributed |
6 years
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6 years
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Maximum | Private Equity and Real Estate | Other Investments [Member] |
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Defined Benefit Plan Disclosure [Line Items] |
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Redemption notice period, upper limit |
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15 years
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Maximum | International Pension Benefits | Cash and Cash Equivalents [Member] |
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Defined Benefit Plan Disclosure [Line Items] |
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Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) |
10.00%
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10.00%
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10.00%
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10.00%
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Maximum | Employee Defined Contribution Plans [Member] |
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Defined Benefit Plan Disclosure [Line Items] |
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Defined contribution plan, employer contribution (percentage) |
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8.00%
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Maximum | Amended Employee Defined Contribution Plans |
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Defined Benefit Plan Disclosure [Line Items] |
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Defined contribution plan, employer contribution (percentage) |
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8.00%
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Defined Benefit Plan, Actuarial Assumptions Discount Rate |
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Defined Benefit Plan Disclosure [Line Items] |
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Defined benefit plan net actuarial loss |
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$ (7,300,000,000)
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$ (7,500,000,000)
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Defined Benefit Plan, Actuarial Assumptions Demographic and Assumption Changes [Member] |
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Defined Benefit Plan Disclosure [Line Items] |
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Defined benefit plan net actuarial loss |
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$ (513,000,000)
|
$ 40,000,000
|
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