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Derivative Assets And Liabilities Table - Gross FV and Netting Offset (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset $ 603 $ 321
Derivative Liability, Fair Value, Gross Liability (974) (560)
Counterparty netting (29) (21)
Counterparty netting 29 21
Payments on margin deposit (477) (263)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 477 263
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 97 37
Derivative Liability, Fair Value, Amount Not Offset Against Collateral (468) (276)
Without offsetting agreements [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 0 0
Derivative Liability, Fair Value, Gross Liability 97 219
OTC Contracts [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 126 45
Derivative Liability, Fair Value, Gross Liability (334) (58)
Broker cleared derivative contracts [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 477 276
Derivative Liability, Fair Value, Gross Liability $ (543) $ (283)