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v2.3.0.11
Financial Instruments, Derivatives, Guarantees (Details) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2010
Dec. 31, 2009
Asset (Liability)        
Cash and cash equivalents $ 112 $ 187 $ 218 $ 153
Carrying Amount [Member]
       
Asset (Liability)        
Cash and cash equivalents 112 187    
ARO Trust investments 40 40    
Other 10 0    
Long-term debt, including current portion (7,024) (6,823)    
Energy commodity cash flow hedges (2) 0    
Fair Value [Member]
       
Asset (Liability)        
Cash and cash equivalents 112 187    
ARO Trust investments 40 40    
Other 10 0    
Long-term debt, including current portion (7,535) (7,283)    
Energy commodity cash flow hedges $ (2) $ 0