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Derivatives and Risk Management Activities - Assets and Liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Derivative assets and liabilities      
Asset Derivatives Fair Value $ 293   $ 90
Liability Derivatives Fair Value (549)   (425)
Net loss deferred in AOCI 190    
Net loss expected to be reclassified to earnings in the next twelve months 8    
Remaining loss expected to be reclassified to earnings through 2049 182    
Interest Rate Derivatives      
Derivative assets and liabilities      
Net deferred gain recognized in AOCI on derivatives 31 $ 7  
Derivatives in Hedging Relationships      
Derivative assets and liabilities      
Asset Derivatives Fair Value 14   2
Liability Derivatives Fair Value (16)   (38)
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other current assets      
Derivative assets and liabilities      
Asset 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      
Asset Derivatives Fair Value 11   2
Liability Derivatives Fair Value (15)   (27)
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other long-term liabilities and deferred credits      
Derivative assets and liabilities      
Liability Derivatives Fair Value (1)   (11)
Derivatives Not Designated as a Hedge      
Derivative assets and liabilities      
Asset Derivatives Fair Value 279   88
Liability Derivatives Fair Value (533)   (387)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other current assets      
Derivative assets and liabilities      
Asset Derivatives Fair Value 260   73
Liability Derivatives Fair Value (418)   (227)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other long-term assets, net      
Derivative assets and liabilities      
Asset Derivatives Fair Value 9   1
Liability Derivatives Fair Value (2)    
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other current liabilities      
Derivative assets and liabilities      
Asset Derivatives Fair Value 9   5
Liability Derivatives Fair Value (72)   (131)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other long-term liabilities and deferred credits      
Derivative assets and liabilities      
Asset Derivatives Fair Value 1   3
Liability Derivatives Fair Value (14)   (5)
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      
Liability Derivatives Fair Value (1)    
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 $ (26)   $ (22)