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Employee Benefit Plans - Funded Status Recognized on Balance Sheet (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Defined Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Other assets $ 100 $ 71
Other liabilities (11) (10)
Net amount recognized as of December 31, 89 61
Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Other assets 0 0
Other liabilities (21) (23)
Net amount recognized as of December 31, $ (21) $ (23)