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Employee Benefit Plans and Postretirement Benefits - Net Periodic Benefit Cost Recognized in Net Income and Other Changes in Plan Assets and Benefit Obligations (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Benefit adjustments included in other comprehensive (income) loss: |  |  |
Total recognized in other comprehensive (income) loss | $ 10 | $ 115 | $ (620)
Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net periodic benefit cost | 151 | 191 | 58
Benefit adjustments included in other comprehensive (income) loss: |  |  |
Net actuarial losses (gains) | (61) |  |
Amortization of actuarial losses | (40) |  |
Amortization of prior service (cost) credit | 0 |  |
Currency translation adjustments and other | 36 |  |
Total recognized in other comprehensive (income) loss | (65) |  |
Total recognized in comprehensive loss | 86 |  |
Healthcare |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net periodic benefit cost | (121) | (115) | (52)
Benefit adjustments included in other comprehensive (income) loss: |  |  |
Net actuarial losses (gains) | 12 |  |
Amortization of actuarial losses | (2) |  |
Amortization of prior service (cost) credit | 131 |  |
Currency translation adjustments and other | 1 |  |
Total recognized in other comprehensive (income) loss | 142 |  |
Total recognized in comprehensive loss | 21 |  |
Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net periodic benefit cost | 24 | $ 33 | $ 24
Benefit adjustments included in other comprehensive (income) loss: |  |  |
Net actuarial losses (gains) | (3) |  |
Amortization of actuarial losses | (5) |  |
Amortization of prior service (cost) credit | 0 |  |
Currency translation adjustments and other | 13 |  |
Total recognized in other comprehensive (income) loss | 5 |  |
Total recognized in comprehensive loss | $ 29 |  |

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