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Consolidated Statement Of Changes In Shareholders' Equity (Parenthetical) (USD $)
In Millions, except Per Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Statement of Stockholders' Equity [Abstract]    
Cash dividends declared per common share $ 0.48 $ 0.36
Common stock awards and options exercised, related taxes $ (9) $ (11)