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Derivative Assets And Liabilities Derivative Assets and Lianilities (Offsetting Agreements Netting Table) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Asset Derivatives $ 560 $ 321
Derivative Liability, Fair Value, Gross Liability (746) (560)
Derivative Asset, Fair Value, Amount Offset Against Collateral (47) (21)
Derivative Liability, Fair Value, Amount Offset Against Collateral 47 21
Derivative Asset, Collateral, Obligation to Return Cash, Offset (397) (263)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 397 263
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 116 37
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 302 276
Without offsetting agreements [Member]    
Asset Derivatives 0 0
Derivative Liability, Fair Value, Gross Liability (163) (219)
OTC Contracts [Member]    
Asset Derivatives 158 45
Derivative Liability, Fair Value, Gross Liability (173) (58)
Broker cleared derivative contracts [Member]    
Asset Derivatives 402 276
Derivative Liability, Fair Value, Gross Liability $ (410) $ (283)