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Income Taxes (Details 3) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Reconciliation of the beginning and ending amount of unrecognized tax benefits      
Unrecognized tax benefit at beginning of year $ 118 $ 58 $ 61
Additions based on tax positions related to the current year 9 1 10
Additions for tax positions of prior years 13 82  
Reductions for tax positions of prior years   (5) (12)
Reductions for lapse of applicable statutes of limitations (9) (18) (1)
Unrecognized tax benefit at end of year $ 131 $ 118 $ 58