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Derivative Assets And Liabilities Derivative Assets and Lianilities (Offsetting Agreements Netting Table) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Asset Derivatives $ 321 $ 363
Derivative Liability, Fair Value, Gross Liability (560) (672)
Derivative Asset, Fair Value, Amount Offset Against Collateral (21) (4)
Derivative Liability, Fair Value, Amount Offset Against Collateral 21 4
Derivative Asset, Collateral, Obligation to Return Cash, Offset (263) (338)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 263 338
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 37 21
Derivative Liability, Fair Value, Amount Not Offset Against Collateral (276) (330)
Without offsetting agreements [Member]    
Asset Derivatives 0 0
Derivative Liability, Fair Value, Gross Liability (219) (194)
OTC Contracts [Member]    
Asset Derivatives 45 25
Derivative Liability, Fair Value, Gross Liability (58) (58)
Broker cleared derivative contracts [Member]    
Asset Derivatives 276 338
Derivative Liability, Fair Value, Gross Liability $ (283) $ (420)