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Pension and Other Postretirement Benefit Plans (Obligations and Funded Status at End of Year) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Other Postretirement Benefits |  |  |
Funded status |  |  |
Fair value of plan assets | $ 0 | $ 0 | $ 0
Benefit obligations | 191 | 355 | 356
Funded status | (191) | (355) |
Amounts recognized in the consolidated balance sheets |  |  |
Noncurrent asset | 0 | 0 |
Current liability | (25) | (33) |
Noncurrent liability | (166) | (322) |
Amount recognized | (191) | (355) |
Amounts recognized in accumulated other comprehensive loss (pre-tax) |  |  |
Net actuarial loss | 23 | 15 |
Prior service (credit) cost | (140) | (16) |
Amount recognized | (117) | (1) |
United States Pension Benefits | Pension Benefits |  |  |
Funded status |  |  |
Fair value of plan assets | 3,103 | 2,934 | 2,676
Benefit obligations | 3,237 | 3,141 | 3,033
Funded status | (134) | (207) |
Amounts recognized in the consolidated balance sheets |  |  |
Noncurrent asset | 37 | 0 |
Current liability | (18) | (6) |
Noncurrent liability | (153) | (201) |
Amount recognized | (134) | (207) |
Amounts recognized in accumulated other comprehensive loss (pre-tax) |  |  |
Net actuarial loss | 1,227 | 1,329 |
Prior service (credit) cost | 1 | 1 |
Amount recognized | 1,228 | 1,330 |
Foreign Pension Benefits | Pension Benefits |  |  |
Funded status |  |  |
Fair value of plan assets | 632 | 593 | 518
Benefit obligations | 1,029 | 941 | $ 834
Funded status | (397) | (348) |
Amounts recognized in the consolidated balance sheets |  |  |
Noncurrent asset | 14 | 11 |
Current liability | (12) | (17) |
Noncurrent liability | (399) | (342) |
Amount recognized | (397) | (348) |
Amounts recognized in accumulated other comprehensive loss (pre-tax) |  |  |
Net actuarial loss | 279 | 234 |
Prior service (credit) cost | 3 | 4 |
Amount recognized | $ 282 | $ 238 |

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