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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, 2012
Dec. 31, 2011
Dec. 31, 2010
Paid-in Surplus [Member]
     
Tax Benefit, Stock-Based Employee Compensation $ 27 $ 24 $ 15
Retained Earnings [Member]
     
Dividends declared per share $ 1.64 $ 1.56 $ 1.48