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Derivatives and Risk Management Activities (Details 4) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Impact of derivative activities recognized in earnings        
Total $ (41) $ 20 $ (53) $ 100
Commodity Derivatives | Supply and Logistics segment revenues
        
Impact of derivative activities recognized in earnings        
Total (21) 18 (29) 105
Commodity Derivatives | Facilities segment revenues
        
Impact of derivative activities recognized in earnings        
Total   (2)   (14)
Commodity Derivatives | Field Operating costs
        
Impact of derivative activities recognized in earnings        
Total (2) 2 (3) 7
Interest Rate Derivatives | Interest expense
        
Impact of derivative activities recognized in earnings        
Total (1) 1 (4) (2)
Foreign Currency Derivatives | Supply and Logistics segment revenues
        
Impact of derivative activities recognized in earnings        
Total (17)   (17)  
Foreign Currency Derivatives | Other income/(expense), net
        
Impact of derivative activities recognized in earnings        
Total   1   4
Derivatives in Hedging Relationships
        
Impact of derivative activities recognized in earnings        
Gain/(loss) reclassified from AOCI into income (5) 106 (16) 124
Other gain/(loss) recognized in income   3   3
Derivatives in Hedging Relationships | Commodity Derivatives | Supply and Logistics segment revenues
        
Impact of derivative activities recognized in earnings        
Gain/(loss) reclassified from AOCI into income (4) 109 (12) 139
Derivatives in Hedging Relationships | Commodity Derivatives | Facilities segment revenues
        
Impact of derivative activities recognized in earnings        
Gain/(loss) reclassified from AOCI into income   (2)   (14)
Derivatives in Hedging Relationships | Interest Rate Derivatives | Interest expense
        
Impact of derivative activities recognized in earnings        
Gain/(loss) reclassified from AOCI into income (1) (2) (4) (5)
Other gain/(loss) recognized in income   3   3
Derivatives in Hedging Relationships | Foreign Currency Derivatives | Other income/(expense), net
        
Impact of derivative activities recognized in earnings        
Gain/(loss) reclassified from AOCI into income   1   4
Derivatives in Hedging Relationships | Hedged Transactions probable of not occurring | Supply and Logistics segment revenues
        
Impact of derivative activities recognized in earnings        
Gain/(loss) reclassified from AOCI into income       3
Derivatives in Hedging Relationships | Hedged Transactions probable of not occurring | Facilities segment revenues
        
Impact of derivative activities recognized in earnings        
Gain/(loss) reclassified from AOCI into income   (2)   (1)
Derivatives Not Designated as a Hedge
        
Impact of derivative activities recognized in earnings        
Total (36) (89) (37) (27)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Supply and Logistics segment revenues
        
Impact of derivative activities recognized in earnings        
Total (17) (91) (17) (34)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Field Operating costs
        
Impact of derivative activities recognized in earnings        
Total (2) 2 (3) 7
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives | Supply and Logistics segment revenues
        
Impact of derivative activities recognized in earnings        
Total $ (17)   $ (17)