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Derivative Assets And Liabilities Derivative Assets and Lianilities (Offsetting Agreements Netting Table) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Asset Derivatives	$ 168	$ 384
Derivative Liability, Fair Value, Gross Liability	(717)	(788)
Derivative Asset, Fair Value, Amount Offset Against Collateral	(44)	(18)
Derivative Liability, Fair Value, Amount Offset Against Collateral	44	18
Derivative Asset, Collateral, Obligation to Return Cash, Offset	(64)	(318)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	64	318
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	60	48
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	609	452
Without offsetting agreements [Member]
Asset Derivatives	0	0
Derivative Liability, Fair Value, Gross Liability	(448)	(399)
OTC Contracts [Member]
Asset Derivatives	53	41
Derivative Liability, Fair Value, Gross Liability	(71)	(39)
Broker cleared derivative contracts [Member]
Asset Derivatives	115	343
Derivative Liability, Fair Value, Gross Liability	$ (198)	$ (350)

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