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, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) $ 8,040 $ 3,174  
Fair value of plan assets at beginning of year 40,864    
Fair value of plan assets at end of year 47,767 40,864  
United States      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets at beginning of year 39,580    
Fair value of plan assets at end of year 46,209 39,580  
International Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets at beginning of year 1,284    
Fair value of plan assets at end of year 1,558 1,284  
Pension Benefits | United States      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation, Projected Benefit Obligation Exceeds the Fair Value of the Plan Assets 54,039 45,333  
Accumulated benefit obligation, Projected Benefit Obligation Exceeds the Fair Value of the Plan Assets 53,194 44,284  
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets 46,172 39,554  
Projected benefit obligation, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets 54,039 45,333  
Accumulated benefit obligation, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets 53,194 44,284  
Fair value of plan assets, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets 46,172 39,554  
Projected benefit obligation at beginning of year 45,333 45,847  
Service cost 1,439 1,661 $ 1,543
Interest cost 2,067 1,799 1,813
Gross benefits paid (2,394) (1,390)  
Plan participants’ contributions 0 0  
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment 0 331  
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) (7,594) 2,915  
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 54,039 45,333 45,847
Fair value of plan assets at beginning of year 39,554 41,932  
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) 6,991 (1,007)  
Defined Benefit Plan, Plan Assets, Contributions by Employer 2,021 19  
Gross benefits paid (2,394) (1,390)  
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 46,172 39,554 41,932
Increase (Decrease) in Defined Benefit Plan Other Fair Value Of Plan Assets 0 0  
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 1,319 630  
Accumulated benefit obligation, Projected Benefit Obligation Exceeds the Fair Value of the Plan Assets 1,210 539  
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets 948 339  
Projected benefit obligation, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets 1,319 630  
Accumulated benefit obligation, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets 1,210 539  
Fair value of plan assets, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets 948 339  
Projected benefit obligation at beginning of year 1,552 1,651  
Service cost 57 62 60
Interest cost 47 45 40
Gross benefits paid (40) (33)  
Plan participants’ contributions 3 3  
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment 1 13  
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) (213) 81  
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) 47 (110)  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement 2 1  
Defined Benefit Plan Other Benefit Obligations 28 3  
Projected benefit obligation at end of year 1,906 1,552 1,651
Fair value of plan assets at beginning of year 1,284 1,333  
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) 171 (6)  
Defined Benefit Plan, Plan Assets, Contributions by Employer 67 80  
Gross benefits paid (40) (33)  
Plan participants’ contributions 3 3  
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) 49 (92)  
Defined Benefit Plan, Plan Assets, Payment for Settlement 2 1  
Fair value of plan assets at end of year 1,558 1,284 1,333
Increase (Decrease) in Defined Benefit Plan Other Fair Value Of Plan Assets (26) 0  
Postemployment Retirement Benefits | United States      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation at beginning of year 2,510 2,792  
Service cost 23 29 29
Interest cost 108 104 112
Gross benefits paid (288) (263)  
Plan participants’ contributions 30 26  
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment 0 0  
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) (233) 178  
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) 0  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement 0  
Defined Benefit Plan Other Benefit Obligations 0  
Projected benefit obligation at end of year 2,616 2,510 2,792
Fair value of plan assets at beginning of year 26 183  
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) (5) (7)  
Defined Benefit Plan, Plan Assets, Contributions by Employer 274 87  
Gross benefits paid (288) (263)  
Plan participants’ contributions 30 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 37 26 $ 183
Increase (Decrease) in Defined Benefit Plan Other Fair Value Of Plan Assets $ 0 $ 0