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Earnings Per Share Exercisable Stock Options Excluded from Computation of EPS (Narrative) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Earnings Per Share, Stock Options Excluded from the Calculation of Diluted EPS 4.0 4.8 5.7
Earnings Per Share, Range of Exercise Prices of Stock Options Excluded from the Calculation of Diluted EPS, Lower End of Range $ 15.56 $ 10.08 $ 8.85
Earnings Per Share, Range of Exercise Prices of Stock Options Excluded from the Calculation of Diluted EPS, Upper End of Range $ 40.83 $ 40.83 $ 40.83