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Consolidated Statement Of Changes In Shareholders' Equity (Parenthetical) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Statement of Stockholders' Equity [Abstract]    
Cash dividends declared per common share $ 0.26 $ 0.24
Common stock awards and options exercised, related taxes $ 27 $ (9)