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Derivative Instruments (Derivative Instruments Offsetting Balance Sheet) (Details) - USD ($) $ in Millions		Mar. 31, 2021	Dec. 31, 2020
Derivative Assets [Abstract]
Derivative Fair Value Of Free Standing Derivative Asset		$ 159	$ 171
Gross Amounts Offset in the Balance Sheet		(34)	(31)
Net Amounts Presented in the Balance Sheet		125	140
Derivative Asset, Fair Value of Collateral	[1]	(33)	(30)
Gross Amounts Not Offset in the Balance Sheet - Cash Collateral Pledged/Received		(81)	(98)
Net Amount		11	12
Derivative Liabilities [Abstract]
Derivative Fair Value Of Free Standing Derivative Liability		87	80
Gross Amounts Offset in the Balance Sheet		(34)	(31)
Net Amounts Presented in the Balance Sheet		53	49
Gross Amounts Not Offset in the Balance Sheet - Financial Instruments	[1]	(118)	(146)
Gross Amounts Not Offset in the Balance Sheet - Cash Collateral Pledged/Received		(43)	(47)
Net Amount		$ (108)	$ (144)
[1] Includes initial margin posted to a central clearing partner.

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Fair value of free standing derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. Excludes embedded derivatives.

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