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Derivatives and Risk Management Activities - Assets and Liabilities (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2016
USD ($)
contract
Dec. 31, 2015
USD ($)
contract
Dec. 31, 2014
USD ($)
Derivative assets and liabilities      
Asset derivatives fair value $ 108 $ 280  
Liability derivatives fair value (481) (110)  
Initial margin 119 91  
Variation margin increase (decrease) 291 (247)  
Net broker receivable 410    
Net broker payable   (156)  
Net loss deferred in AOCI 228    
Net loss expected to be reclassified to earnings in the next twelve months 8    
Remaining loss expected to be reclassified to earnings through 2049 220    
Net deferred gain/(loss) recognized in AOCI on derivatives $ (33) $ 1 $ (86)
Number of outstanding derivatives containing credit-risk related contingent features | contract 0 0  
Derivative credit-risk related contingent features none of our outstanding derivatives contained credit-risk related contingent features that would result in a material adverse impact to us upon any change in our credit ratings    
Commodity Derivatives      
Derivative assets and liabilities      
Net deferred gain/(loss) recognized in AOCI on derivatives $ 0 $ 33 15
Interest Rate Derivatives      
Derivative assets and liabilities      
Net deferred gain/(loss) recognized in AOCI on derivatives (33) (32) (103)
Foreign Currency Derivatives      
Derivative assets and liabilities      
Net deferred gain/(loss) recognized in AOCI on derivatives     $ 2
Derivatives in Hedging Relationships      
Derivative assets and liabilities      
Asset derivatives fair value 0 5  
Liability derivatives fair value (50) (52)  
Derivatives in Hedging Relationships | Commodity Derivatives | Other current assets      
Derivative assets and liabilities      
Asset derivatives fair value   4  
Liability derivatives fair value 0 (2)  
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other long-term assets, net      
Derivative assets and liabilities      
Asset derivatives fair value   1  
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other current liabilities      
Derivative assets and liabilities      
Liability derivatives fair value (23) (17)  
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other long-term liabilities and deferred credits      
Derivative assets and liabilities      
Liability derivatives fair value (27) (33)  
Derivatives Not Designated as a Hedge      
Derivative assets and liabilities      
Asset derivatives fair value 108 275  
Liability derivatives fair value (431) (58)  
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other current assets      
Derivative assets and liabilities      
Asset derivatives fair value 101 265  
Liability derivatives fair value (344) (35)  
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other long-term assets, net      
Derivative assets and liabilities      
Asset derivatives fair value 2 10  
Liability derivatives fair value (1) (1)  
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other current liabilities      
Derivative assets and liabilities      
Liability derivatives fair value (14) (13)  
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other long-term liabilities and deferred credits      
Derivative assets and liabilities      
Asset derivatives fair value 2    
Liability derivatives fair value (34) (1)  
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) $ (8)  
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 $ (32)