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Pension and Other Benefit Plans - Changes in Projected Benefit Obligation, Plan Assets and Funded Status of Plans (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Change in Plan Assets      
Benefits paid     $ (257)
Amounts Recognized in Balance Sheet      
Postretirement Benefits $ (231) $ (1,049)  
Other Assets 1,034 360  
United States      
Change in Projected Benefit Obligations      
Projected benefit obligation at beginning of year 4,940 4,593  
Service cost 44 55 49
Interest cost 127 148 180
Actuarial (gains) losses (211) 370  
Benefits paid (232) (226)  
Projected benefit obligation at end of year 4,668 4,940 4,593
Change in Plan Assets      
Plan assets at fair value at beginning of year 4,776 4,236  
Actual return on plan assets 145 760  
Company contributions 7 6  
Benefits paid (232) (226)  
Plan assets at fair value at end of year 4,696 4,776 4,236
Asset / (Unfunded Liability) 28 (164)  
Amounts Recognized in Balance Sheet      
Postretirement Benefits (212) (199)  
Other Assets 240 35  
Total of post retirement benefits 28 (164)  
Amounts Recognized in Accumulated Other Comprehensive Loss      
Actuarial losses 276 423  
Prior service cost   1  
Total amount recognized in accumulated other comprehensive income 276 424  
Accumulated benefit obligation 4,484 4,739  
International      
Change in Projected Benefit Obligations      
Projected benefit obligation at beginning of year 11,140 9,647  
Service cost 117 140 112
Interest cost 267 301 333
Contribution by plan participants 53 94  
Actuarial (gains) losses (586) 1,228  
Currency effect (18) 68  
Benefits paid (355) (338)  
Projected benefit obligation at end of year 10,618 11,140 9,647
Change in Plan Assets      
Plan assets at fair value at beginning of year 10,493 9,363  
Actual return on plan assets 1,040 1,282  
Currency effect (28) 72  
Company contributions 18 20  
Contributions by plan participants 53 94  
Benefits paid (355) (338)  
Plan assets at fair value at end of year 11,221 10,493 $ 9,363
Asset / (Unfunded Liability) 603 (647)  
Amounts Recognized in Balance Sheet      
Postretirement Benefits (19) (849)  
Other Assets 622 202  
Total of post retirement benefits 603 (647)  
Amounts Recognized in Accumulated Other Comprehensive Loss      
Actuarial losses 1,174 1,981  
Total amount recognized in accumulated other comprehensive income 1,174 1,981  
Accumulated benefit obligation $ 10,370 $ 10,844