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Long-Term Incentive Employee Compensation (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Long-Term Incentive Employee Compensation Costs    
Share-based compensation expense, equity-based awards $ 3 $ 3
Share-based compensation expense, liability-based awards 0 1
Total share-based compensation expense in operating income (loss) 3 4
Tax benefit (1) (1)
Share-based compensation expense, net of tax $ 2 $ 3