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Stock-based Compensation Expense Stock-based Compensation Expense (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended 36 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized     4,687,500     4,687,500
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant     3,931,204     3,931,204
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value     $ 1 $ 3 $ 4  
Share-based Compensation 1.0 3.0 4.0 2.0 1.0  
Adjustments Related to Tax Withholding for Share-based Compensation     0 0.5 1.0  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized     $ 4.0     $ 4.0
Stock-based Compensation, Attainment of Performance Goals That Allows Vesting     121.80% 117.90% 91.10%  
Stock-based Compensation, Forfeiture Rate           6.00%