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Derivatives and Risk Management Activities - Assets and Liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Derivative assets and liabilities          
Asset Derivatives Fair Value $ 98   $ 98   $ 108
Liability Derivatives Fair Value (373)   (373)   (481)
Net loss deferred in AOCI 224   224    
Net loss expected to be reclassified to earnings in the next twelve months     8    
Remaining loss expected to be reclassified to earnings through 2049     216    
Interest Rate Derivatives          
Derivative assets and liabilities          
Net deferred gain/(loss) recognized in AOCI on derivatives (3) $ (20) (15) $ (178)  
Derivatives in Hedging Relationships          
Derivative assets and liabilities          
Asset Derivatives Fair Value 2   2    
Liability Derivatives Fair Value (36)   (36)   (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 (10)   (10)   (27)
Derivatives Not Designated as a Hedge          
Derivative assets and liabilities          
Asset Derivatives Fair Value 96   96   108
Liability Derivatives Fair Value (337)   (337)   (431)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other current assets          
Derivative assets and liabilities          
Asset Derivatives Fair Value 74   74   101
Liability Derivatives Fair Value (184)   (184)   (344)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other long-term assets, net          
Derivative assets and liabilities          
Asset Derivatives Fair Value 1   1   2
Liability Derivatives Fair Value         (1)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other current liabilities          
Derivative assets and liabilities          
Asset Derivatives Fair Value 10   10    
Liability Derivatives Fair Value (97)   (97)   (14)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other long-term liabilities and deferred credits          
Derivative assets and liabilities          
Asset Derivatives Fair Value 5   5   2
Liability Derivatives Fair Value (19)   (19)   (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 (2)   (2)    
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives | Other current liabilities          
Derivative assets and liabilities          
Asset Derivatives Fair Value         3
Liability Derivatives Fair Value (2)   (2)   (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 $ (33)   $ (33)   $ (32)