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Derivatives and Risk Management Activities (Details 4) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Impact of derivative activities recognized in earnings      
Total $ 124,000,000 $ (36,000,000) $ 23,000,000
Commodity | Supply and Logistics segment revenues
     
Impact of derivative activities recognized in earnings      
Total 72,000,000 (62,000,000) 16,000,000
Commodity | Facilities segment revenues
     
Impact of derivative activities recognized in earnings      
Total 3,000,000 11,000,000  
Commodity | Transportation segment revenues
     
Impact of derivative activities recognized in earnings      
Total     2,000,000
Commodity | Purchases and related costs
     
Impact of derivative activities recognized in earnings      
Total 46,000,000 6,000,000 (4,000,000)
Commodity | Field Operating costs
     
Impact of derivative activities recognized in earnings      
Total 1,000,000 1,000,000 3,000,000
Interest Rate Contracts | Interest expense
     
Impact of derivative activities recognized in earnings      
Total (3,000,000) 1,000,000 3,000,000
Net gain associated with interest rate swaps designated as fair value hedges 2,000,000 2,000,000 1,000,000
Foreign exchange contracts | Supply and Logistics segment revenues
     
Impact of derivative activities recognized in earnings      
Total (1,000,000) 1,000,000 2,000,000
Foreign exchange contracts | Purchases and related costs
     
Impact of derivative activities recognized in earnings      
Total     2,000,000
Foreign exchange contracts | Other income/(expense), net
     
Impact of derivative activities recognized in earnings      
Total 6,000,000 6,000,000 (1,000,000)
Derivatives designated as hedging instruments
     
Impact of derivative activities recognized in earnings      
Total 62,000,000 (137,000,000) 25,000,000
Derivatives in Cash Flow Hedging Relationships - Ineffective Portion (2,000,000) (8,000,000) (1,000,000)
Derivatives designated as hedging instruments | Commodity | Supply and Logistics segment revenues
     
Impact of derivative activities recognized in earnings      
Total 12,000,000 (161,000,000) 14,000,000
Derivatives designated as hedging instruments | Commodity | Facilities segment revenues
     
Impact of derivative activities recognized in earnings      
Total 2,000,000 11,000,000  
Derivatives designated as hedging instruments | Commodity | Transportation segment revenues
     
Impact of derivative activities recognized in earnings      
Total     2,000,000
Derivatives designated as hedging instruments | Commodity | Purchases and related costs
     
Impact of derivative activities recognized in earnings      
Total 45,000,000 6,000,000 8,000,000
Derivatives designated as hedging instruments | Interest Rate Contracts | Interest expense
     
Impact of derivative activities recognized in earnings      
Total (3,000,000) 1,000,000 1,000,000
Derivatives designated as hedging instruments | Foreign exchange contracts | Other income/(expense), net
     
Impact of derivative activities recognized in earnings      
Total 6,000,000 6,000,000  
Derivatives not designated as hedging instruments
     
Impact of derivative activities recognized in earnings      
Total 62,000,000 101,000,000 (2,000,000)
Derivatives not designated as hedging instruments | Commodity | Supply and Logistics segment revenues
     
Impact of derivative activities recognized in earnings      
Total 60,000,000 96,000,000 2,000,000
Derivatives not designated as hedging instruments | Commodity | Facilities segment revenues
     
Impact of derivative activities recognized in earnings      
Total 1,000,000    
Derivatives not designated as hedging instruments | Commodity | Purchases and related costs
     
Impact of derivative activities recognized in earnings      
Total 1,000,000   (12,000,000)
Derivatives not designated as hedging instruments | Commodity | Field Operating costs
     
Impact of derivative activities recognized in earnings      
Total 1,000,000 1,000,000 3,000,000
Derivatives not designated as hedging instruments | Interest Rate Contracts | Interest expense
     
Impact of derivative activities recognized in earnings      
Total     2,000,000
Derivatives not designated as hedging instruments | Foreign exchange contracts | Supply and Logistics segment revenues
     
Impact of derivative activities recognized in earnings      
Total (1,000,000) 1,000,000 2,000,000
Derivatives not designated as hedging instruments | Foreign exchange contracts | Purchases and related costs
     
Impact of derivative activities recognized in earnings      
Total     2,000,000
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other income/(expense), net
     
Impact of derivative activities recognized in earnings      
Total     $ (1,000,000)