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Derivatives and Risk Management Activities - Preferred Distribution Rate (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Derivatives and Risk Management Activities          
Gain/(loss) recognized     $ 17 $ 16  
Preferred Distribution Rate Reset Option | Derivatives Not Designated as a Hedge | Other long-term liabilities and deferred credits          
Derivatives and Risk Management Activities          
Derivative liability $ 17   17   $ 34
Preferred Distribution Rate Reset Option | Derivatives Not Designated as a Hedge | Other income/(expense), net          
Derivatives and Risk Management Activities          
Gain/(loss) recognized $ 9 $ 7 $ 17 $ 16