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Shareholders' Equity and Stock-Based Compensation (Details 5) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Stock option activity, Shares      
Exercised (in shares) (154) (238) (154)
Restricted stock and restricted stock units
     
Unvested Restricted Stock and Restricted Stock Units      
Outstanding at the beginning of the period (in shares) 1,516 1,435 1,251
Granted (in shares) 836 738 667
Vested (in shares) (636) (626) (429)
Forfeited (in shares) (276) (31) (54)
Outstanding at the end of the period (in shares) 1,440 1,516 1,435
Weighted-Average Grant-Date Fair Value      
Outstanding at the beginning of the period (in dollars per share) 50.97 51.75 58.01
Granted (in dollars per share) 62.72 48.91 33.42
Vested (in dollars per share) 51.47 50.46 41.75
Forfeited (in dollars per share) 67.21 47.82 54.61
Outstanding at the end of the period (in dollars per share) 54.38 50.97 51.75
Unrecognized compensation cost      
Unrecognized compensation cost related to restricted stock and restricted stock unit 18.1    
Weighted-average period over which unrecognized compensation costs will be recognized (in years) 1.5    
Stock options
     
Stock option activity, Shares      
Options outstanding and exercisable at the beginning of the period (in shares) 635 881 1,308
Exercised (in shares) (154) (238) (154)
Terminated (in shares) (117) (8) (273)
Options outstanding and exercisable at the end of the period (in shares) 364 635 881
Weighted-average Exercise Price      
Options outstanding and exercisable at the beginning of the period (in dollars per share) 63.82 59.86 64.89
Exercised (in dollars per share) 65.44 48.21 39.69
Terminated (in dollars per share) 89.10 90.23 94.80
Options outstanding and exercisable at the end of the period (in dollars per share) 54.87 63.82 59.86
Stock option outstanding and exercisable      
Weighted average remaining term of stock options outstanding and exercisable at the end of the period (in years) 0.5    
Number of in-the-money options exercisable (in shares) 178    
Aggregate intrinsic value of options outstanding and exercisable (in dollars) 3.8    
Aggregate intrinsic value of options exercised 2.5 4.1 2.7