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Fair Values (Details 1) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Liabilities [Abstract]    
Derivatives $ 204 $ 419
Total liabilities 204 419
Level 1 [Member]
   
Liabilities [Abstract]    
Derivatives 0 0
Total liabilities 0 0
Level 2 [Member]
   
Liabilities [Abstract]    
Derivatives 204 419
Total liabilities 204 419
Level 3 [Member]
   
Liabilities [Abstract]    
Total liabilities $ 0 $ 0