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Derivative Assets And Liabilities (Derivative Amount Of Gain (Loss) Recognized) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Amount of Gain/(Loss) Recognized in Income on Derivatives $ (23) $ 0 $ (220)
Gains (losses) on interest rate derivatives 47 (37) (12)
Commodity Derivatives [Member] | Cost of Sales [Member]      
Amount of Gain/(Loss) Recognized in Income Representing Hedge Ineffectiveness and Amount Excluded from the Assessment of Effectiveness (3) 26 14
Embedded Derivatives in Preferred Units [Member] | Other Income (Expenses) [Member]      
Amount of Gain/(Loss) Recognized in Income on Derivatives 0 1 4
Non Trading [Member] | Commodity Derivatives [Member] | Cost of Sales [Member]      
Amount of Gain/(Loss) Recognized in Income on Derivatives (102) 5 (177)
Trading [Member] | Commodity Derivatives [Member] | Cost of Sales [Member]      
Amount of Gain/(Loss) Recognized in Income on Derivatives $ 32 $ 31 $ (35)