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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Amount of Gain/(Loss) Recognized in Income on Derivatives $ (171) $ (259) $ (251) $ (261)
Gains (losses) on interest rate derivatives (122) 20 (196) 72
Commodity Derivatives [Member]        
Gain (Loss) on Components Excluded from Assessment of Price Risk Hedge Effectiveness 0 6 0 9
Amount of Gain/(Loss) Recognized in Income on Derivatives (29) (295) (41) (366)
Commodity Derivatives - Trading [Member]        
Amount of Gain/(Loss) Recognized in Income on Derivatives $ (20) $ 16 $ (14) $ 33