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Derivatives - Credit Risk (Details) - Not designated as hedging instruments - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Derivative [Line Items]    
Aggregate fair value of derivative instruments with credit-risk-related contingent features for which a net liability position existed (net of collateral) $ 43 $ 787
Amount of collateral posted related to derivative instruments with credit-risk-related contingent features 424 $ 169
Marketing Derivatives    
Derivative [Line Items]    
Aggregate fair value of derivative instruments with credit-risk-related contingent features for which a net liability position existed (net of collateral) $ 23