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Derivative Instruments (Derivative Instruments Offsetting Balance Sheet) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Derivative Asset [Abstract] |  |  |
Derivative Fair Value Of Free Standing Derivative Asset |  | $ 223 | $ 194
Derivative Asset, Fair Value, Gross Liability |  | (53) | (19)
Derivative Asset |  | 170 | 175
Derivative Asset, Fair Value of Collateral | [1] | (170) | (175)
Derivative, Collateral, Obligation to Return Cash |  | 0 | 0
Derivative Liability [Abstract] |  |  |
Derivative Fair Value Of Free Standing Derivative Liability |  | 236 | 58
Derivative Liability, Fair Value, Gross Asset |  | (53) | (19)
Derivative Liability |  | 183 | 39
Derivative Liability, Fair Value of Collateral | [1] | (183) | (39)
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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