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Derivative Assets And Liabilities Table - Partnership's Derivative Assets and Liabilities Amount of Gain (Loss) Recognized (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Amount of Gain/(Loss) Recognized in Income on Derivatives $ (81) $ (2)
Gains (losses) on interest rate derivatives (74) 52
Commodity Derivatives [Member]    
Gain (Loss) on Components Excluded from Assessment of Price Risk Hedge Effectiveness 0 3
Amount of Gain/(Loss) Recognized in Income on Derivatives (12) (71)
Commodity Derivatives - Trading [Member]    
Amount of Gain/(Loss) Recognized in Income on Derivatives $ 5 $ 17