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Additional Interest Charges from Early Extinguishment of Debt (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Additional Interest Charges from Early Extinguishment of Debt      
Additional interest charges $ 25 $ 9  
Reduction of interest expense, recognition of unamortized proceeds from terminated interest rate swaps   9  
Additional interest charges for note repurchase premiums and the write-off of unamortized finance fees, net of a gain from the termination of interest rate swap agreements     $ 5