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Derivative Instruments - Offsetting Assets and Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Derivative assets    
Gross amount recognized $ 3,677 $ 3,523
Financial instruments (211) (165)
Collateral (received)/pledged (3,355) (3,196)
Off-balance sheet securities collateral (26) (46)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 0 0
Derivative liabilities    
Gross amount recognized (288) (298)
Financial instruments 211 165
Collateral (received)/pledged 67 144
Derivative Asset, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election 85 116
Derivative Liability, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election (10) (11)
Derivative Asset, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election, Excluding Obligation to Return Securities 111 162
Derivative Liability, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election, Excluding Right to Reclaim Securities $ (10) $ 11