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Consolidated Statements of Shareholders' Equity (Parenthetical) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Paid-In Surplus [Member]
     
Tax Benefit, Stock-Based Employee Compensation $ 24 $ 15 $ 6
Retained Earnings [Member]
     
Dividends Declared Per Share $ 1.56 $ 1.48 $ 1.40