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Employee Benefit Plans - Funded Status Recognized on Balance Sheet (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Defined Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Other assets | $ 108 | $ 100
Other liabilities | (12) | (11)
Net amount recognized as of December 31, | 96 | 89
Other Postretirement Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Other assets | 0 | 0
Other liabilities | (15) | (21)
Net amount recognized as of December 31, | $ (15) | $ (21)

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