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Long-Term Incentive Employee Compensation (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Long-Term Incentive Employee Compensation Expense      
Share-based compensation expense, equity-based awards $ 23 $ 14 $ 16
Share-based compensation expense, liability-based awards 2 (4) 2
Total share-based compensation expense in operating income (loss) 25 10 18
Tax benefit 8 3 6
Share-based compensation expense, net of tax $ 17 $ 7 $ 12