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Derivatives and Risk Management Activities (Details 4) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Impact of derivative activities recognized in earnings        
Total $ 20 $ 36 $ (11) $ 80
Commodity Derivatives | Supply and Logistics segment revenues
        
Impact of derivative activities recognized in earnings        
Total 12 42 (8) 88
Commodity Derivatives | Facilities segment revenues
        
Impact of derivative activities recognized in earnings        
Total   (9)   (12)
Commodity Derivatives | Field Operating costs
        
Impact of derivative activities recognized in earnings        
Total   4 (1) 5
Interest Rate Derivatives | Interest expense
        
Impact of derivative activities recognized in earnings        
Total (1) (2) (2) (3)
Foreign Currency Derivatives | Supply and Logistics segment revenues
        
Impact of derivative activities recognized in earnings        
Total 9      
Foreign Currency Derivatives | Other income/(expense), net
        
Impact of derivative activities recognized in earnings        
Total   1   2
Derivatives designated as hedging instruments
        
Impact of derivative activities recognized in earnings        
Amount of gain/(loss) reclassified from AOCI into income 11 11 (10) 16
Derivatives designated as hedging instruments | Commodity Derivatives | Supply and Logistics segment revenues
        
Impact of derivative activities recognized in earnings        
Amount of gain/(loss) reclassified from AOCI into income 12 21 (8) 29
Derivatives designated as hedging instruments | Commodity Derivatives | Facilities segment revenues
        
Impact of derivative activities recognized in earnings        
Amount of gain/(loss) reclassified from AOCI into income   (9)   (12)
Derivatives designated as hedging instruments | Interest Rate Derivatives | Interest expense
        
Impact of derivative activities recognized in earnings        
Amount of gain/(loss) reclassified from AOCI into income (1) (2) (2) (3)
Derivatives designated as hedging instruments | Foreign Currency Derivatives | Other income/(expense), net
        
Impact of derivative activities recognized in earnings        
Amount of gain/(loss) reclassified from AOCI into income   1   2
Derivatives designated as hedging instruments | Hedged Transactions probable of not occurring | Supply and Logistics segment revenues
        
Impact of derivative activities recognized in earnings        
Amount of gain/(loss) reclassified from AOCI into income   1   3
Derivatives designated as hedging instruments | Hedged Transactions probable of not occurring | Facilities segment revenues
        
Impact of derivative activities recognized in earnings        
Amount of gain/(loss) reclassified from AOCI into income   1   1
Derivatives not designated as hedging instruments
        
Impact of derivative activities recognized in earnings        
Total 9 25 (1) 64
Derivatives not designated as hedging instruments | Commodity Derivatives | Supply and Logistics segment revenues
        
Impact of derivative activities recognized in earnings        
Total   21   59
Derivatives not designated as hedging instruments | Commodity Derivatives | Field Operating costs
        
Impact of derivative activities recognized in earnings        
Total   4 (1) 5
Derivatives not designated as hedging instruments | Foreign Currency Derivatives | Supply and Logistics segment revenues
        
Impact of derivative activities recognized in earnings        
Total $ 9