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Supplemental Equity and Comprehensive Income Information (Details 1) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Supplemental Equity and Comprehensive Income Information        
Common stock, par value per share (in dollars per share) $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare    
Common stock, shares authorized (in shares) 3,000,000,000us-gaap_CommonStockSharesAuthorized      
Common stock, shares issued (in shares) 944,033,056us-gaap_CommonStockSharesIssued      
Treasury stock (in shares) 308,898,462us-gaap_TreasuryStockShares 280,736,817us-gaap_TreasuryStockShares 256,941,406us-gaap_TreasuryStockShares 249,063,015us-gaap_TreasuryStockShares
Preferred stock, shares authorized 10,000,000us-gaap_PreferredStockSharesAuthorized