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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Pension Plan |  |  |
Change in plan assets |  |  |
Employer contributions | $ 615 | $ 1,700 | $ 1,230
Other Postretirement Benefits Plan |  |  |
Change in benefit obligations |  |  |
Beginning benefit obligation | 5,744 | 6,374 |
Service cost | 17 | 20 | 19
Interest cost | 220 | 195 | 202
Actuarial (gains) losses | 641 | (389) |
Benefits paid | (395) | (388) |
Foreign currency translation adjustments | 54 | (106) |
Curtailments, settlements and other | 23 | 38 |
Ending benefit obligation | 6,304 | 5,744 | 6,374
Change in plan assets |  |  |
Beginning fair value of plan assets | 0 | 0 |
Actual return on plan assets | 0 | 0 |
Employer contributions | 370 | 369 |
Benefits paid | (395) | (388) |
Foreign currency translation adjustments | 0 | 0 |
Settlements and other | 25 | 19 |
Ending fair value of plan assets | 0 | 0 | 0
Ending funded status | (6,304) | (5,744) |
Amounts recorded in the consolidated balance sheets |  |  |
Non-current assets | 0 | 0 |
Current liabilities | (369) | (374) |
Non-current liabilities | (5,935) | (5,370) |
Net amount recorded | (6,304) | (5,744) |
Amounts recorded in Accumulated other comprehensive loss |  |  |
Net actuarial loss | (1,364) | (752) |
Net prior service (cost) credit | 27 | 34 |
Total recorded in Accumulated other comprehensive loss | (1,337) | (718) |
U.S. | Pension Plan |  |  |
Change in benefit obligations |  |  |
Beginning benefit obligation | 61,190 | 68,450 |
Service cost | 179 | 209 |
Interest cost | 2,264 | 2,050 | 2,145
Actuarial (gains) losses | 6,444 | (4,449) |
Benefits paid | (4,753) | (4,898) |
Foreign currency translation adjustments | 0 | 0 |
Curtailments, settlements and other | (640) | (172) |
Ending benefit obligation | 64,684 | 61,190 | 68,450
Change in plan assets |  |  |
Beginning fair value of plan assets | 56,102 | 62,639 |
Actual return on plan assets | 8,454 | (1,419) |
Employer contributions | 83 | 76 | 77
Benefits paid | (4,753) | (4,898) |
Foreign currency translation adjustments | 0 | 0 |
Settlements and other | (647) | (296) |
Ending fair value of plan assets | 59,239 | 56,102 | 62,639
Ending funded status | (5,445) | (5,088) |
Amounts recorded in the consolidated balance sheets |  |  |
Non-current assets | 0 | 0 |
Current liabilities | (68) | (73) |
Non-current liabilities | (5,377) | (5,015) |
Net amount recorded | (5,445) | (5,088) |
Amounts recorded in Accumulated other comprehensive loss |  |  |
Net actuarial loss | (1,980) | (752) |
Net prior service (cost) credit | 14 | 19 |
Total recorded in Accumulated other comprehensive loss | (1,966) | (733) |
U.S. | Other Postretirement Benefits Plan |  |  |
Change in plan assets |  |  |
Employer contributions | 326 | 325 | 323
Non-U.S. | Pension Plan |  |  |
Change in benefit obligations |  |  |
Beginning benefit obligation | 19,904 | 22,789 |
Service cost | 120 | 149 |
Interest cost | 456 | 464 | 473
Actuarial (gains) losses | 1,653 | (272) |
Benefits paid | (1,234) | (1,595) |
Foreign currency translation adjustments | 561 | (1,452) |
Curtailments, settlements and other | (62) | (179) |
Ending benefit obligation | 21,398 | 19,904 | 22,789
Change in plan assets |  |  |
Beginning fair value of plan assets | 13,528 | 14,495 |
Actual return on plan assets | 1,669 | 301 |
Employer contributions | 532 | 1,624 | 1,153
Benefits paid | (1,234) | (1,595) |
Foreign currency translation adjustments | 668 | (1,106) |
Settlements and other | (202) | (191) |
Ending fair value of plan assets | 14,961 | 13,528 | $ 14,495
Ending funded status | (6,437) | (6,376) |
Amounts recorded in the consolidated balance sheets |  |  |
Non-current assets | 698 | 496 |
Current liabilities | (342) | (349) |
Non-current liabilities | (6,793) | (6,523) |
Net amount recorded | (6,437) | (6,376) |
Amounts recorded in Accumulated other comprehensive loss |  |  |
Net actuarial loss | (4,688) | (3,983) |
Net prior service (cost) credit | (78) | (64) |
Total recorded in Accumulated other comprehensive loss | $ (4,766) | $ (4,047) |

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