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Derivative Instruments (Derivative Instruments Offsetting Balance Sheet) (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Derivative Assets [Abstract] |  |  |
Derivative Fair Value Of Free Standing Derivative Asset |  | $ 177 | $ 171
Gross Amounts Offset in the Balance Sheet |  | (31) | (31)
Net Amounts Presented in the Balance Sheet |  | 146 | 140
Derivative Asset, Fair Value of Collateral | [1] | (36) | (30)
Gross Amounts Not Offset in the Balance Sheet - Cash Collateral Pledged/Received |  | (100) | (98)
Net Amount |  | 10 | 12
Derivative Liabilities [Abstract] |  |  |
Derivative Fair Value Of Free Standing Derivative Liability |  | 75 | 80
Gross Amounts Offset in the Balance Sheet |  | (31) | (31)
Net Amounts Presented in the Balance Sheet |  | 44 | 49
Gross Amounts Not Offset in the Balance Sheet - Financial Instruments | [1] | (121) | (146)
Gross Amounts Not Offset in the Balance Sheet - Cash Collateral Pledged/Received |  | (48) | (47)
Net Amount |  | $ (125) | $ (144)
[1] | Includes initial margin posted to a central clearing partner.

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