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Consolidated Balance Sheet (Parenthetical) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Consolidated Balance Sheet    
Common stock, par value per share (in dollars per share) $ 0.01 $ 0.01
Common stock, shares issued (in shares) 944,033,056 944,033,056
Treasury stock (in shares) 289,754,609 280,736,817