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Derivatives and Risk Management Activities - Embedded Derivatives (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Embedded Derivatives    
Gain recognized due to changes in fair value   $ 25
Preferred Distribution Rate Reset Option | Series A Preferred Units    
Embedded Derivatives    
Fair value of derivative liability $ 35 35
Gain recognized due to changes in fair value $ 25 $ 25