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Derivatives and Risk Management Activities - Assets and Liabilities (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
contract
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
contract
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
contract
Derivative assets and liabilities          
Asset Derivatives Fair Value $ 82   $ 82   $ 280
Liability Derivatives Fair Value (344)   (344)   (110)
Broker receivable 142   142    
Initial margin 96   96   91
Variation margin posted/(returned) 46   46   (247)
Broker payable         $ 156
Net loss deferred in AOCI 374   374    
Net loss expected to be reclassified to earnings in the next twelve months     7    
Remaining loss expected to be reclassified to earnings through 2049     367    
Net deferred gain/(loss) recognized in AOCI on derivatives $ (20) $ (48) $ (178) $ (28)  
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   37   12  
Interest Rate Derivatives          
Derivative assets and liabilities          
Net deferred gain/(loss) recognized in AOCI on derivatives $ (20) $ (85) $ (178) $ (40)  
Derivatives in Hedging Relationships          
Derivative assets and liabilities          
Asset Derivatives Fair Value 1   1   $ 5
Liability Derivatives Fair Value (175)   (175)   (52)
Derivatives in Hedging Relationships | Commodity Derivatives | Other current assets          
Derivative assets and liabilities          
Asset Derivatives Fair Value 1   1   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 (72)   (72)   (17)
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other long-term liabilities and deferred credits          
Derivative assets and liabilities          
Liability Derivatives Fair Value (103)   (103)   (33)
Derivatives Not Designated as a Hedge          
Derivative assets and liabilities          
Asset Derivatives Fair Value 81   81   275
Liability Derivatives Fair Value (169)   (169)   (58)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other current assets          
Derivative assets and liabilities          
Asset Derivatives Fair Value 77   77   265
Liability Derivatives Fair Value (119)   (119)   (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 (10)   (10)   (13)
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    
Liability Derivatives Fair Value (18)   (18)   (1)
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives | Other current liabilities          
Derivative assets and liabilities          
Asset Derivatives Fair Value 1   1    
Liability Derivatives Fair Value (4)   (4)   $ (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 $ (18)   $ (18)