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Derivative Instruments - Offsetting Assets and Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Derivative assets    
Gross amount recognized $ 3,786 $ 3,523
Financial instruments (277) (165)
Collateral (received)/pledged (3,531) (3,196)
Off-balance sheet securities collateral 0 (46)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 0 0
Derivative liabilities    
Gross amount recognized (303) (298)
Financial instruments 277 165
Collateral (received)/pledged 18 144
Derivative Asset, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election (22) (116)
Derivative Liability, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election (8) (11)
Derivative Asset, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election, Excluding Obligation to Return Securities (22) 162
Derivative Liability, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election, Excluding Right to Reclaim Securities $ (8) $ 11