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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Amount of Gain/(Loss) Recognized in Income on Derivatives $ (259) $ 7 $ (261) $ 26
Commodity Derivatives - Trading [Member] | Cost of Products Sold [Member]        
Amount of Gain/(Loss) Recognized in Income on Derivatives 16 15 33 26
Commodity Derivatives [Member] | Cost of Products Sold [Member]        
Amount of Gain/(Loss) Recognized in Income Representing Hedge Ineffectiveness and Amount Excluded from the Assessment of Effectiveness 6 6 9 2
Amount of Gain/(Loss) Recognized in Income on Derivatives (295) 17 (366) 19
Interest Rate Derivatives [Member] | Gains On Interest Rate Derivatives [Member]        
Amount of Gain/(Loss) Recognized in Income on Derivatives 20 (25) 72 (20)
Embedded Derivatives [Member] | Other Income (Expenses) [Member]        
Amount of Gain/(Loss) Recognized in Income on Derivatives $ 0 $ 0 $ 0 $ 1