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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
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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

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