Annual report pursuant to Section 13 and 15(d)

COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Projected Benefit Obligation, Accumulated Benefit Obligation, and Fair Value of Plan Assets for Pension Plans With an Accumulated Benefit Obligation in Excess of Plan Assets (Detail)

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COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Projected Benefit Obligation, Accumulated Benefit Obligation, and Fair Value of Plan Assets for Pension Plans With an Accumulated Benefit Obligation in Excess of Plan Assets (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) $ 3,174 $ (4,441)  
Fair value of plan assets at beginning of year 43,448    
Fair value of plan assets at end of year 40,864 43,448  
Pension Benefits | U.S. Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation, Projected Benefit Obligation Exceeds the Fair Value of the Plan Assets 45,333 37,113  
Accumulated benefit obligation, Projected Benefit Obligation Exceeds the Fair Value of the Plan Assets 44,284 35,538  
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets 39,554 32,914  
Projected benefit obligation, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets 45,333 37,113  
Accumulated benefit obligation, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets 44,284 35,538  
Fair value of plan assets, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets 39,554 32,914  
Projected benefit obligation at beginning of year 45,847 41,069  
Service cost 1,661 1,543 $ 1,412
Interest cost 1,799 1,813 1,828
Gross benefits paid (1,390) (1,309)  
Plan participants’ contributions 0 0  
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment 331 0  
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 2,915 (4,256)  
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) 0 0  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement 0 1,525  
Defined Benefit Plan Other Benefit Obligations 0 0  
Projected benefit obligation at end of year 45,333 45,847 41,069
Fair value of plan assets at beginning of year 41,932 31,215  
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) (1,007) 4,717  
Defined Benefit Plan, Plan Assets, Contributions by Employer 19 7,309  
Gross benefits paid (1,390) (1,309)  
Plan participants’ contributions 0 0  
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) 0 0  
Defined Benefit Plan, Plan Assets, Payment for Settlement 0 0  
Fair value of plan assets at end of year 39,554 41,932 31,215
Pension Benefits | International Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation, Projected Benefit Obligation Exceeds the Fair Value of the Plan Assets 630 1,138  
Accumulated benefit obligation, Projected Benefit Obligation Exceeds the Fair Value of the Plan Assets 539 992  
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets 339 798  
Projected benefit obligation, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets 630 647  
Accumulated benefit obligation, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets 539 549  
Fair value of plan assets, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets 339 342  
Projected benefit obligation at beginning of year 1,651 1,425  
Service cost 62 60 49
Interest cost 45 40 41
Gross benefits paid (33) (32)  
Plan participants’ contributions 3 3  
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment 13 0  
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 81 (26)  
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) (110) 129  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement 1 3  
Defined Benefit Plan Other Benefit Obligations 3 3  
Projected benefit obligation at end of year 1,552 1,651 1,425
Fair value of plan assets at beginning of year 1,333 1,092  
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) (6) 96  
Defined Benefit Plan, Plan Assets, Contributions by Employer 80 77  
Gross benefits paid (33) (32)  
Plan participants’ contributions 3 3  
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) (92) 100  
Defined Benefit Plan, Plan Assets, Payment for Settlement 1 3  
Fair value of plan assets at end of year 1,284 1,333 1,092
Postemployment Retirement Benefits | U.S. Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation at beginning of year 2,792 2,730  
Service cost 29 29 28
Interest cost 104 112 124
Gross benefits paid (263) (264)  
Plan participants’ contributions 26 26  
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment 0 0  
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 178 (159)  
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) 0 0  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement 0 0  
Defined Benefit Plan Other Benefit Obligations 0 0  
Projected benefit obligation at end of year 2,510 2,792 2,730
Fair value of plan assets at beginning of year 183 15  
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) (7) (2)  
Defined Benefit Plan, Plan Assets, Contributions by Employer 87 408  
Gross benefits paid (263) (264)  
Plan participants’ contributions 26 26  
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) 0 0  
Defined Benefit Plan, Plan Assets, Payment for Settlement 0 0  
Fair value of plan assets at end of year $ 26 $ 183 $ 15