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Derivatives and Risk Management Activities - Assets and Liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Derivative assets and liabilities          
Asset Derivatives Fair Value $ 130   $ 130   $ 108
Liability Derivatives Fair Value (168)   (168)   (481)
Net loss deferred in AOCI 231   231    
Net loss expected to be reclassified to earnings in the next twelve months     8    
Remaining loss expected to be reclassified to earnings through 2049     223    
Interest Rate Derivatives          
Derivative assets and liabilities          
Net deferred gain/(loss) recognized in AOCI on derivatives (19) $ (68) (12) $ (158)  
Derivatives in Hedging Relationships          
Derivative assets and liabilities          
Asset Derivatives Fair Value 2   2    
Liability Derivatives Fair Value (34)   (34)   (50)
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other current liabilities          
Derivative assets and liabilities          
Asset Derivatives Fair Value 2   2    
Liability Derivatives Fair Value (26)   (26)   (23)
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other long-term liabilities and deferred credits          
Derivative assets and liabilities          
Liability Derivatives Fair Value (8)   (8)   (27)
Derivatives Not Designated as a Hedge          
Derivative assets and liabilities          
Asset Derivatives Fair Value 128   128   108
Liability Derivatives Fair Value (134)   (134)   (431)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other current assets          
Derivative assets and liabilities          
Asset Derivatives Fair Value 111   111   101
Liability Derivatives Fair Value (71)   (71)   (344)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other long-term assets, net          
Derivative assets and liabilities          
Asset Derivatives Fair Value 7   7   2
Liability Derivatives Fair Value (1)   (1)   (1)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other current liabilities          
Derivative assets and liabilities          
Liability Derivatives Fair Value (14)   (14)   (14)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other long-term liabilities and deferred credits          
Derivative assets and liabilities          
Asset Derivatives Fair Value 3   3   2
Liability Derivatives Fair Value (9)   (9)   (34)
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives | Other current assets          
Derivative assets and liabilities          
Asset Derivatives Fair Value 6   6    
Liability Derivatives Fair Value (3)   (3)    
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives | Other current liabilities          
Derivative assets and liabilities          
Asset Derivatives Fair Value 1   1   3
Liability Derivatives Fair Value (1)   (1)   (6)
Derivatives Not Designated as a Hedge | Preferred Distribution Rate Reset Option | Other long-term liabilities and deferred credits          
Derivative assets and liabilities          
Liability Derivatives Fair Value $ (35)   $ (35)   $ (32)