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Derivatives (Estimated Fair Value of Derivatives Assets and Liabilities after Master Netting Agreements and Cash Collateral) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Offsetting Derivative Assets [Abstract] |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | $ 3,605 | $ 3,506
Derivative Asset, Not Offset, Policy Election Deduction | (3,308) | (3,112)
Derivative Asset, Collateral, Obligation to Return Cash, Offset | (275) | (164)
Derivative Asset, Fair Value, Amount Offset Against Collateral | 22 | 230
Derivative Asset, Collateral, Obligation to Return Securities, Offset | (16) | (194)
Derivative Asset, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election | 6 | 36
Offsetting Derivative Liabilities [Abstract] |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 5,181 | 4,925
Derivative Liability, Not Offset, Policy Election Deduction | (3,308) | (3,112)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 0 | (8)
Derivative Liability, Fair Value, Amount Offset Against Collateral | 1,873 | 1,805
Derivative Liability, Collateral, Right to Reclaim Securities, Offset | (1,873) | (1,805)
Derivative Liability, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election | $ 0 | $ 0

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