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Derivatives and Risk Management Activities (Details 4) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Impact of derivative activities recognized in earnings    
Total $ (30) $ 41
Commodity Derivatives | Supply and Logistics segment revenues
   
Impact of derivative activities recognized in earnings    
Total (19) 45
Commodity Derivatives | Facilities segment revenues
   
Impact of derivative activities recognized in earnings    
Total   (4)
Commodity Derivatives | Field Operating costs
   
Impact of derivative activities recognized in earnings    
Total (1) 1
Interest Rate Derivatives | Interest expense
   
Impact of derivative activities recognized in earnings    
Total (1) (2)
Foreign Currency Derivatives | Supply and Logistics segment revenues
   
Impact of derivative activities recognized in earnings    
Total (9)  
Foreign Currency Derivatives | Other expense, net
   
Impact of derivative activities recognized in earnings    
Total   1
Derivatives designated as hedging instruments
   
Impact of derivative activities recognized in earnings    
Amount of gain/(loss) reclassified from AOCI into income (20) 5
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 (19) 10
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   (4)
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)
Derivatives designated as hedging instruments | Foreign Currency Derivatives | Other expense, net
   
Impact of derivative activities recognized in earnings    
Amount of gain/(loss) reclassified from AOCI into income   1
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   2
Derivatives not designated as hedging instruments
   
Impact of derivative activities recognized in earnings    
Total (10) 36
Derivatives not designated as hedging instruments | Commodity Derivatives | Supply and Logistics segment revenues
   
Impact of derivative activities recognized in earnings    
Total   35
Derivatives not designated as hedging instruments | Commodity Derivatives | Field Operating costs
   
Impact of derivative activities recognized in earnings    
Total (1) 1
Derivatives not designated as hedging instruments | Foreign Currency Derivatives | Supply and Logistics segment revenues
   
Impact of derivative activities recognized in earnings    
Total $ (9)