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Derivative Instruments (Derivative Instruments Offsetting Balance Sheet) (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Derivative Assets [Abstract] |  |  |
Derivative Fair Value Of Free Standing Derivative Asset |  | $ 220 | $ 194
Gross Amounts Offset in the Balance Sheet |  | (59) | (19)
Net Amounts Presented in the Balance Sheet |  | 161 | 175
Derivative Asset, Fair Value of Collateral | [1] | (161) | (175)
Net Amount |  | 0 | 0
Derivative Liabilities [Abstract] |  |  |
Derivative Fair Value Of Free Standing Derivative Liability |  | 357 | 58
Gross Amounts Offset in the Balance Sheet |  | (59) | (19)
Net Amounts Presented in the Balance Sheet |  | 298 | 39
Gross Amounts Not Offset in the Balance Sheet - Financial Instruments | [1] | (298) | (39)
Net Amount |  | $ 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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