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Derivatives (Estimated Fair Value of Derivatives Assets and Liabilities after Master Netting Agreements and Cash Collateral) (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Offsetting Derivative Assets [Abstract]    
Derivative Asset, Fair Value, Amount Not Offset Against Collateral $ 3,092 $ 3,495
Derivative Asset, Not Offset, Policy Election Deduction (2,480) (3,112)
Derivative Asset, Collateral, Obligation to Return Cash, Offset (441) (154)
Derivative Asset, Fair Value, Amount Offset Against Collateral 171 229
Derivative Asset, Collateral, Obligation to Return Securities, Offset (107) (194)
Derivative Asset, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election 64 35
Offsetting Derivative Liabilities [Abstract]    
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 4,033 4,917
Derivative Liability, Not Offset, Policy Election Deduction (2,480) (3,112)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 0 0
Derivative Liability, Fair Value, Amount Offset Against Collateral 1,553 1,805
Derivative Liability, Collateral, Right to Reclaim Securities, Offset (1,544) (1,805)
Derivative Liability, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election $ 9 $ 0