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Derivative Assets And Liabilities Derivative Assets and Lianilities (Offsetting Agreements Netting Table) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Asset Derivatives	$ 384	$ 560
Derivative Liability, Fair Value, Gross Liability	(788)	(746)
Derivative Asset, Fair Value, Amount Offset Against Collateral	(18)	(47)
Derivative Liability, Fair Value, Amount Offset Against Collateral	18	47
Derivative Asset, Collateral, Obligation to Return Cash, Offset	(318)	(397)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	318	397
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	48	116
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	452	302
Without offsetting agreements [Member]
Asset Derivatives	0	0
Derivative Liability, Fair Value, Gross Liability	(399)	(163)
OTC Contracts [Member]
Asset Derivatives	41	158
Derivative Liability, Fair Value, Gross Liability	(39)	(173)
Broker cleared derivative contracts [Member]
Asset Derivatives	343	402
Derivative Liability, Fair Value, Gross Liability	$ (350)	$ (410)

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