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Derivative Instruments (Derivative Instruments Offsetting Balance Sheet) (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
Derivative Asset [Abstract]
Derivative Fair Value Of Free Standing Derivative Asset		$ 154	$ 223
Derivative Asset, Fair Value, Gross Liability		(57)	(53)
Derivative Asset		97	170
Derivative Asset, Fair Value of Collateral	[1]	(97)	(170)
Derivative, Collateral, Obligation to Return Cash		0	0
Derivative Liability [Abstract]
Derivative Fair Value Of Free Standing Derivative Liability		254	236
Derivative Liability, Fair Value, Gross Asset		(57)	(53)
Derivative Liability		197	183
Derivative Liability, Fair Value of Collateral	[1]	(197)	(183)
Derivative, Collateral, Right to Reclaim Cash		$ 0	$ 0
[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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Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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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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