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Derivatives and Risk Management Activities - Embedded Derivatives (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2016
USD ($)
Embedded Derivatives    
Gain recognized due to changes in fair value   $ 42
Preferred Distribution Rate Reset Option | Series A Preferred Units    
Embedded Derivatives    
Fair value of derivative liability $ 18 18
Gain recognized due to changes in fair value $ 17 $ 42