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Employee Benefit Plans - Schedule of Pre-tax Change in Other Comprehensive Loss (Income) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Pension Benefits |  |  |
Recognized in the Balance Sheet |  |  |
Losses (Gains) | $ 21 | $ 223 |
Expense (Income) Recognized in the Income Statement |  |  |
Amortization of Net Loss | 30 | 41 | $ 41
Settlement (Gain) Loss | 0 | (1) | 11
Amortization of Prior Service Costs | 0 | 0 | 0
Amortization of net losses estimated to be expensed in next fiscal year | 57 |  |
Post-retirement Benefits |  |  |
Recognized in the Balance Sheet |  |  |
Losses (Gains) | 22 | (112) |
Expense (Income) Recognized in the Income Statement |  |  |
Amortization of Net Loss | 0 | 0 | 0
Settlement (Gain) Loss | 0 | 0 | 0
Amortization of Prior Service Costs | $ (7) | $ (2) | $ 0

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