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Pensions And Other Postretirement Benefits - Pensions and OPEB Obligations and Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension Plan      
Change in plan assets      
Employer contributions $ 438 $ 464 $ 615
Other Postretirement Benefits Plan      
Change in benefit obligations      
Beginning benefit obligation 6,656 6,304  
Service cost 18 19 17
Interest cost 123 173 220
Actuarial (gains) losses (282) 551  
Benefits paid (424) (408)  
Foreign currency translation adjustments 4 (3)  
Curtailments, settlements and other 29 20  
Ending benefit obligation 6,124 6,656 6,304
Change in plan assets      
Beginning fair value of plan assets 0 0  
Actual return on plan assets 0 0  
Employer contributions 400 387  
Benefits paid (424) (408)  
Foreign currency translation adjustments 0 0  
Settlements and other 24 21  
Ending fair value of plan assets 0 0 0
Ending funded status (6,124) (6,656)  
Amounts recorded in the consolidated balance sheets      
Non-current assets 0 0  
Current liabilities (381) (379)  
Non-current liabilities (5,743) (6,277)  
Net amount recorded (6,124) (6,656)  
Amounts recorded in Accumulated other comprehensive loss      
Net actuarial loss (1,439) (1,823)  
Net prior service (cost) credit 15 20  
Total recorded in Accumulated other comprehensive loss (1,424) (1,803)  
U.S. | Pension Plan      
Change in benefit obligations      
Beginning benefit obligation 66,468 64,684  
Service cost 187 177  
Interest cost 1,074 1,716 2,264
Actuarial (gains) losses (2,564) 4,757  
Benefits paid (4,414) (4,600)  
Foreign currency translation adjustments 0 0  
Curtailments, settlements and other (543) (266)  
Ending benefit obligation 60,208 66,468 64,684
Change in plan assets      
Beginning fair value of plan assets 61,077 59,239  
Actual return on plan assets 3,734 6,635  
Employer contributions 67 68 83
Benefits paid (4,414) (4,600)  
Foreign currency translation adjustments 0 0  
Settlements and other (543) (265)  
Ending fair value of plan assets 59,921 61,077 59,239
Ending funded status (287) (5,391)  
Amounts recorded in the consolidated balance sheets      
Non-current assets 1,896 0  
Current liabilities (70) (66)  
Non-current liabilities (2,113) (5,325)  
Net amount recorded (287) (5,391)  
Amounts recorded in Accumulated other comprehensive loss      
Net actuarial loss (13) (3,256)  
Net prior service (cost) credit 7 11  
Total recorded in Accumulated other comprehensive loss (6) (3,245)  
U.S. | Other Postretirement Benefits Plan      
Change in plan assets      
Employer contributions 351 343 326
Non-U.S. | Pension Plan      
Change in benefit obligations      
Beginning benefit obligation 20,807 21,398  
Service cost 109 133  
Interest cost 236 362 456
Actuarial (gains) losses (1,015) 1,506  
Benefits paid (1,151) (1,132)  
Foreign currency translation adjustments (509) 870  
Curtailments, settlements and other (163) (2,330)  
Ending benefit obligation 18,314 20,807 21,398
Change in plan assets      
Beginning fair value of plan assets 13,846 14,961  
Actual return on plan assets 602 1,573  
Employer contributions 371 396 532
Benefits paid (1,151) (1,132)  
Foreign currency translation adjustments 10 389  
Settlements and other (157) (2,341)  
Ending fair value of plan assets 13,521 13,846 $ 14,961
Ending funded status (4,793) (6,961)  
Amounts recorded in the consolidated balance sheets      
Non-current assets 1,440 980  
Current liabilities (338) (364)  
Non-current liabilities (5,895) (7,577)  
Net amount recorded (4,793) (6,961)  
Amounts recorded in Accumulated other comprehensive loss      
Net actuarial loss (3,675) (5,123)  
Net prior service (cost) credit (54) (60)  
Total recorded in Accumulated other comprehensive loss $ (3,729) $ (5,183)