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Derivative Instruments (Derivative Instruments Offsetting Balance Sheet) (Details) - USD ($) $ in Millions		Sep. 30, 2021	Dec. 31, 2020
Derivative Assets [Abstract]
Derivative Fair Value Of Free Standing Derivative Asset		$ 190	$ 171
Gross Amounts Offset in the Balance Sheet		(22)	(31)
Net Amounts Presented in the Balance Sheet		168	140
Derivative Asset, Fair Value of Collateral	[1]	(24)	(30)
Gross Amounts Not Offset in the Balance Sheet - Cash Collateral Pledged/Received		(147)	(98)
Net Amount		(3)	12
Derivative Liabilities [Abstract]
Derivative Fair Value Of Free Standing Derivative Liability		65	80
Gross Amounts Offset in the Balance Sheet		(22)	(31)
Net Amounts Presented in the Balance Sheet		43	49
Gross Amounts Not Offset in the Balance Sheet - Financial Instruments	[1]	(116)	(146)
Gross Amounts Not Offset in the Balance Sheet - Cash Collateral Pledged/Received		(36)	(47)
Net Amount		$ (109)	$ (144)
[1] Includes initial margin posted to a central clearing partner.

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