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Derivative Assets And Liabilities Derivative Assets and Lianilities (Offsetting Agreements Netting Table) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Asset Derivatives $ 363 $ 454
Derivative Liability, Fair Value, Gross Liability (672) (532)
Derivative Asset, Fair Value, Amount Offset Against Collateral (4) (17)
Derivative Liability, Fair Value, Amount Offset Against Collateral 4 17
Derivative Asset, Collateral, Obligation to Return Cash, Offset (338) (309)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 338 309
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 21 128
Derivative Liability, Fair Value, Amount Not Offset Against Collateral (330) (206)
Without offsetting agreements [Member]    
Asset Derivatives 0 0
Derivative Liability, Fair Value, Gross Liability (194) (176)
OTC Contracts [Member]    
Asset Derivatives 25 63
Derivative Liability, Fair Value, Gross Liability (58) (47)
Broker cleared derivative contracts [Member]    
Asset Derivatives 338 391
Derivative Liability, Fair Value, Gross Liability $ (420) $ (309)