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Derivative Instruments (Derivative Instruments Offsetting Balance Sheet) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Derivative Asset [Abstract] |  |  |
Derivative Fair Value Of Free Standing Derivative Asset |  | $ 154 | $ 223
Derivative Asset, Fair Value, Gross Liability |  | (57) | (53)
Derivative Asset |  | 97 | 170
Derivative Asset, Fair Value of Collateral | [1] | (97) | (170)
Derivative, Collateral, Obligation to Return Cash |  | 0 | 0
Derivative Liability [Abstract] |  |  |
Derivative Fair Value Of Free Standing Derivative Liability |  | 254 | 236
Derivative Liability, Fair Value, Gross Asset |  | (57) | (53)
Derivative Liability |  | 197 | 183
Derivative Liability, Fair Value of Collateral | [1] | (197) | (183)
Derivative, Collateral, Right to Reclaim Cash |  | $ 0 | $ 0
[1] | Includes initial margin posted to a central clearing partner for financial instruments and excludes the excess of collateral received/pledged from/to the counterparty.

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