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Derivatives and Risk Management Activities - Financial Impact (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Impact of derivative activities recognized in earnings      
Total Gain/(Loss) on Derivatives Recognized in Net Income $ 156 $ 153 $ (41)
Commodity Derivatives | Supply and Logistics segment revenues      
Impact of derivative activities recognized in earnings      
Total Gain/(Loss) on Derivatives Recognized in Net Income 208 205 (39)
Commodity Derivatives | Transportation segment revenues      
Impact of derivative activities recognized in earnings      
Total Gain/(Loss) on Derivatives Recognized in Net Income 8    
Commodity Derivatives | Facilities segment revenues      
Impact of derivative activities recognized in earnings      
Total Gain/(Loss) on Derivatives Recognized in Net Income     (11)
Commodity Derivatives | Field operating costs      
Impact of derivative activities recognized in earnings      
Total Gain/(Loss) on Derivatives Recognized in Net Income (18) (21) 8
Interest Rate Derivatives | Interest expense      
Impact of derivative activities recognized in earnings      
Total Gain/(Loss) on Derivatives Recognized in Net Income (11) (5) (4)
Foreign Currency Derivatives | Supply and Logistics segment revenues      
Impact of derivative activities recognized in earnings      
Total Gain/(Loss) on Derivatives Recognized in Net Income (31) (28)  
Foreign Currency Derivatives | Other income/(expense), net      
Impact of derivative activities recognized in earnings      
Total Gain/(Loss) on Derivatives Recognized in Net Income   2 5
Derivatives in Hedging Relationships      
Impact of derivative activities recognized in earnings      
Total Gain/(Loss) on Derivatives Recognized in Net Income 45 (4) 67
Derivatives in Hedging Relationships | Commodity Derivatives | Supply and Logistics segment revenues      
Impact of derivative activities recognized in earnings      
Total Gain/(Loss) on Derivatives Recognized in Net Income 56 (1) 77
Derivatives in Hedging Relationships | Commodity Derivatives | Facilities segment revenues      
Impact of derivative activities recognized in earnings      
Total Gain/(Loss) on Derivatives Recognized in Net Income     (11)
Derivatives in Hedging Relationships | Interest Rate Derivatives | Interest expense      
Impact of derivative activities recognized in earnings      
Total Gain/(Loss) on Derivatives Recognized in Net Income (11) (5) (4)
Derivatives in Hedging Relationships | Foreign Currency Derivatives | Other income/(expense), net      
Impact of derivative activities recognized in earnings      
Total Gain/(Loss) on Derivatives Recognized in Net Income   2 5
Derivatives Not Designated as a Hedge      
Impact of derivative activities recognized in earnings      
Total Gain/(Loss) on Derivatives Recognized in Net Income 111 157 (108)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Supply and Logistics segment revenues      
Impact of derivative activities recognized in earnings      
Total Gain/(Loss) on Derivatives Recognized in Net Income 152 206 (116)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Transportation segment revenues      
Impact of derivative activities recognized in earnings      
Total Gain/(Loss) on Derivatives Recognized in Net Income 8    
Derivatives Not Designated as a Hedge | Commodity Derivatives | Field operating costs      
Impact of derivative activities recognized in earnings      
Total Gain/(Loss) on Derivatives Recognized in Net Income (18) (21) $ 8
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives | Supply and Logistics segment revenues      
Impact of derivative activities recognized in earnings      
Total Gain/(Loss) on Derivatives Recognized in Net Income $ (31) $ (28)