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Consolidated Statement Of Changes In 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
Statement of Stockholders' Equity [Abstract]      
Cash dividends declared per common share $ 0.96 $ 0.72 $ 0.04
Common stock awards and options exercised, related taxes $ (6) $ (14) $ (11)