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Consolidated Statement of Changes In Shareholders' Equity (Unaudited) (Parenthetical) (USD $)
In Millions, except Per Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Statement of Stockholders' Equity [Abstract]    
Cash dividends declared per common share $ 0.52 $ 0.48
Common stock awards and options exercised, related taxes $ 32 $ (9)