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Derivative Assets And Liabilities Table - Gross FV and Netting Offset (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 255	$ 321
Derivative Liability, Fair Value, Gross Liability	(517)	(560)
Counterparty netting	(63)	(21)
Counterparty netting	63	21
Payments on margin deposit	(165)	(263)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	165	263
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	27	37
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	(289)	(276)
Without offsetting agreements [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	167	219
OTC Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	89	45
Derivative Liability, Fair Value, Gross Liability	(144)	(58)
Broker cleared derivative contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	166	276
Derivative Liability, Fair Value, Gross Liability	$ (206)	$ (283)

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