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Derivatives and Risk Management Activities - Assets and Liabilities (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
contract
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
contract
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
contract
Derivative assets and liabilities          
Asset Derivatives Fair Value $ 53   $ 53   $ 280
Liability Derivatives Fair Value (396)   (396)   (110)
Broker receivable 274   274    
Broker payable         156
Initial margin 84   84   91
Variation margin posted/(returned) 190   190   $ (247)
Net loss deferred in AOCI 355   355    
Net loss expected to be reclassified to earnings in the next twelve months     5    
Remaining loss expected to be reclassified to earnings through 2049     350    
Net deferred gain/(loss) recognized in AOCI on derivatives $ (68) $ 92 $ (158) $ 20  
Number of outstanding derivatives containing credit-risk related contingent features | contract 0   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   (28)   (25)  
Interest Rate Derivatives          
Derivative assets and liabilities          
Net deferred gain/(loss) recognized in AOCI on derivatives $ (68) $ 120 $ (158) $ 45  
Derivatives in Hedging Relationships          
Derivative assets and liabilities          
Asset Derivatives Fair Value 2   2   $ 5
Liability Derivatives Fair Value (155)   (155)   (52)
Derivatives in Hedging Relationships | Commodity Derivatives | Other current assets          
Derivative assets and liabilities          
Asset Derivatives Fair Value 2   2   4
Liability Derivatives Fair Value         (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 (64)   (64)   (17)
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other long-term liabilities and deferred credits          
Derivative assets and liabilities          
Liability Derivatives Fair Value (91)   (91)   (33)
Derivatives Not Designated as a Hedge          
Derivative assets and liabilities          
Asset Derivatives Fair Value 51   51   275
Liability Derivatives Fair Value (241)   (241)   (58)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other current assets          
Derivative assets and liabilities          
Asset Derivatives Fair Value 45   45   265
Liability Derivatives Fair Value (182)   (182)   (35)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other long-term assets, net          
Derivative assets and liabilities          
Asset Derivatives Fair Value         10
Liability Derivatives Fair Value         (1)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other current liabilities          
Derivative assets and liabilities          
Liability Derivatives Fair Value (6)   (6)   (13)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other long-term liabilities and deferred credits          
Derivative assets and liabilities          
Asset Derivatives Fair Value 6   6    
Liability Derivatives Fair Value (17)   (17)   (1)
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives | Other current liabilities          
Derivative assets and liabilities          
Liability Derivatives Fair Value (1)   (1)   $ (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 $ (35)   $ (35)