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Share-Based Compensation (Stock Option Information) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2011
years
Share-Based Compensation  
Vested or Expected to Vest, Options 3,138,881
Vested or Expected to Vest, Weighted-Average Exercise Price $ 18.55
Vested or Expected to Vest, Weighted-Average Remaining Contractual Life 8.0
Vested or Expected to Vest, Aggregate Intrinsic Value $ 14 [1]
Exercisable, Options 1,744,506
Exercisable, Weighted-Average Exercise Price $ 17.25
Exercisable, Weighted-Average Remaining Contractual Term 6.9
Exercisable, Aggregate Intrinsic Value $ 10 [1]
[1] Intrinsic value for stock options is calculated based on the difference between the exercise price of the underlying awards and the quoted market price of our common stock as of the reporting date.