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Derivative Instruments (Derivative Instruments Offsetting Balance Sheet) (Details) - USD ($) $ in Millions		Dec. 31, 2021	Dec. 31, 2020
Derivative Asset [Abstract]
Derivative Fair Value Of Free Standing Derivative Asset		$ 194	$ 171
Derivative Asset, Fair Value, Gross Liability		(19)	(31)
Derivative Asset		175	140
Derivative Asset, Fair Value of Collateral	[1]	(175)	(128)
Derivative, Collateral, Obligation to Return Cash		0	12
Derivative Liability [Abstract]
Derivative Fair Value Of Free Standing Derivative Liability		58	80
Derivative Liability, Fair Value, Gross Asset		(19)	(31)
Derivative Liability		39	49
Derivative Liability, Fair Value of Collateral	[1]	(39)	(193)
Derivative, Collateral, Right to Reclaim Cash		$ 0	$ (144)
[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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- Definition

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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Fair value of securities received as collateral against derivative assets.

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Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

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