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Stock-Based Compensation (Summary of Restricted Stock Award Activity) (Details) (Restricted Stock Awards [Member], USD $)
In Millions, except Share data in Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2011
Restricted Stock Awards [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares outstanding at the beginning of the year, number of shares 4,297
Shares granted, number of shares 886 [1]
Shares vested, number of shares (1,559) [2]
Shares forfeited, number of shares (53)
Shares outstanding at the end of the period, number of shares 3,571
Shares granted, weighted-average grant-date fair value $ 37.04
Weighted-average requisite service period (years) 2.5Y
Expected volatility rate on restricted stock awards 48.00%
Fair value of shares on vesting date $ 68.0
[1] Weighted-average grant-date fair value of $37.04 per share and a weighted-average requisite service period of 2.5 years. The awards with market conditions included an expected volatility of 48% in the Monte Carlo simulation used to measure grant date fair value.
[2] Fair value on vesting date of $68.0 million.