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Stockholders' Equity (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Stockholders' Equity, Number of Shares, Par Value and Other Disclosures [Abstract]      
Preferred stock, shares authorized 100,000 100,000  
Preferred stock, par value per share $ 100 $ 100  
Common stock, shares authorized 500,000,000 500,000,000  
Common stock, par value per share $ 1.0 $ 1.0  
Common stock, shares issued 255,320,345 254,119,478  
Number of treasury shares held 85,413,416 79,401,585  
Share Repurchases [Line Items]      
Shares repurchased 6,011,831.000 12,401,098.000 4,115,139.000
Average price per share for repurchased shares (in dollars per share) $ 76.16 $ 60.38 $ 58.93
May 2012 Authorization [Member]
      
Share Repurchases [Line Items]      
Number of shares authorized to be repurchased   10,000,000  
Remaining number of shares authorized to be repurchased 3,908,289    
November 2012 Authorization [Member]
      
Share Repurchases [Line Items]      
Authorized dollar amount for share repurchase program   $ 1,000,000,000  
Shares repurchased 6,005,880    
Remaining dollar amount authorized to be repurchased $ 292,565,000    
Shares repurchased in open market [Member]
      
Share Repurchases [Line Items]      
Shares repurchased 6,005,880 12,314,795 4,034,973
Shares repurchased from holders of employee stock options [Member]
      
Share Repurchases [Line Items]      
Shares repurchased 5,951 86,303 80,166