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CONSOLIDATED STATEMENTS OF SHAREHOLDERS EQUITY (Parenthetical) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dividends Declared Per Share $ 0.44 $ 0.41
Paid-In-Surplus [Member]
   
Tax Benefit, Stock-Based Employee Compensation $ 27 $ 19
Retained Earnings [Member]
   
Dividends Declared Per Share $ 0.44 $ 0.41