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Derivative Instruments (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2011
months
years
Dec. 31, 2010
Qualifying Hedges    
Assets $ 104 $ 86
Liabilities (111) (79)
Economic Hedges    
Assets 15 17
Liabilities (65) (27)
General Discussion of Derivative Instruments and Hedging Activities [Abstract]    
Maturity range min (in months) 3  
Maturity range max (in months) 18  
Cash flow hedge gains (losses) recorded in accumulated OCI 1 (21)
Cash flow hedge gains (losses) recorded in accumulated OCI deferred gains (losses) $ 37 $ 17