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Derivatives and Risk Management Activities - Assets and Liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivative assets and liabilities      
Asset derivatives fair value $ 90 $ 108  
Liability derivatives fair value (425) (481)  
Initial margin 48 119  
Variation margin posted 164 291  
Net broker receivable 212 410  
Net loss deferred in AOCI 223    
Net loss expected to be reclassified to earnings in the next twelve months 8    
Remaining loss expected to be reclassified to earnings through 2049 215    
Net deferred gain/(loss) recognized in AOCI on derivatives (16) (33) $ 1
Commodity Derivatives      
Derivative assets and liabilities      
Net deferred gain/(loss) recognized in AOCI on derivatives     33
Interest Rate Derivatives      
Derivative assets and liabilities      
Net deferred gain/(loss) recognized in AOCI on derivatives (16) (33) $ (32)
Derivatives in Hedging Relationships      
Derivative assets and liabilities      
Asset derivatives fair value 2    
Liability derivatives fair value (38) (50)  
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other current liabilities      
Derivative assets and liabilities      
Asset derivatives fair value 2    
Liability derivatives fair value (27) (23)  
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other long-term liabilities and deferred credits      
Derivative assets and liabilities      
Liability derivatives fair value (11) (27)  
Derivatives Not Designated as a Hedge      
Derivative assets and liabilities      
Asset derivatives fair value 88 108  
Liability derivatives fair value (387) (431)  
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other current assets      
Derivative assets and liabilities      
Asset derivatives fair value 73 101  
Liability derivatives fair value (227) (344)  
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other long-term assets, net      
Derivative assets and liabilities      
Asset derivatives fair value 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 5    
Liability derivatives fair value (131) (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 2  
Liability derivatives fair value (5) (34)  
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives | Other current assets      
Derivative assets and liabilities      
Asset derivatives fair value 6    
Liability derivatives fair value (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   (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 $ (22) $ (32)