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Employee Benefit Plans - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Pension |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Plan assets contributions by employer | $ 4 |  | $ 9 |
Total estimated contributions by employer during fiscal year | 21 |  | 21 |
Defined Benefit Plan, Expected Future Benefit Payment, Remainder of Fiscal Year | 12 |  | 12 |
Postretirement Plan |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Plan assets contributions by employer | 1 |  | 1 |
Total estimated contributions by employer during fiscal year | 2 |  | 2 |
Defined Benefit Plan, Expected Future Benefit Payment, Remainder of Fiscal Year | 1 |  | 1 |
Postemployment Retirement Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Plan assets contributions by employer | 3 |  | 7 |
Total estimated contributions by employer during fiscal year | 30 |  | 30 |
Defined Benefit Plan, Expected Future Benefit Payment, Remainder of Fiscal Year | 23 |  | 23 |
Net Benefit Cost | $ 6 | $ 5 | $ 11 | $ 18

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