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Derivative Assets And Liabilities Table - Gross FV and Netting Offset (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 419	$ 321
Derivative Liability, Fair Value, Gross Liability	(931)	(560)
Counterparty netting	(49)	(21)
Counterparty netting	49	21
Payments on margin deposit	(306)	(263)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	306	263
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	64	37
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	(576)	(276)
Without offsetting agreements [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	147	219
OTC Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	112	45
Derivative Liability, Fair Value, Gross Liability	(430)	(58)
Broker cleared derivative contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	307	276
Derivative Liability, Fair Value, Gross Liability	$ (354)	$ (283)

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