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Derivative Instruments (Derivative Instruments Offsetting Balance Sheet) (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Derivative Assets [Abstract] |  |  |
Derivative Fair Value Of Free Standing Derivative Asset |  | $ 210 | $ 137
Gross Amounts Offset in the Balance Sheet |  | (36) | (20)
Net Amounts Presented in the Balance Sheet |  | 174 | 117
Derivative Asset, Fair Value of Collateral | [1] | 0 | 0
Gross Amounts Not Offset in the Balance Sheet - Cash Collateral Pledged/Received |  | (164) | (119)
Net Amount |  | 10 | (2)
Derivative Liabilities [Abstract] |  |  |
Derivative Fair Value Of Free Standing Derivative Liability |  | 94 | 73
Gross Amounts Offset in the Balance Sheet |  | (36) | (20)
Net Amounts Presented in the Balance Sheet |  | 58 | 53
Gross Amounts Not Offset in the Balance Sheet - Financial Instruments | [1] | (128) | (92)
Gross Amounts Not Offset in the Balance Sheet - Cash Collateral Pledged/Received |  | (60) | (52)
Net Amount |  | $ (130) | $ (91)
[1] | Includes initial margin posted to a central clearing partner.

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