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Employee Benefit Plans - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Pension |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Plan assets contributions by employer | $ 4 |
Defined Benefit Plan, Expected Future Benefit Payment, Remainder of Fiscal Year | 13 |
Total estimated contributions by employer during fiscal year | 17 |
Postretirement Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Plan assets contributions by employer | 0 |
Defined Benefit Plan, Expected Future Benefit Payment, Remainder of Fiscal Year | 1 |
Total estimated contributions by employer during fiscal year | 1 |
Postemployment Retirement Benefits |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Net benefit cost | 13 | $ 6
Plan assets contributions by employer | 7 |
Defined Benefit Plan, Expected Future Benefit Payment, Remainder of Fiscal Year | 30 |
Total estimated contributions by employer during fiscal year | $ 23 |

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