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Consolidated Statements of Equity (Parenthetical) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Statement Of Stockholders Equity [Abstract]      
Issuance of common stock related to exercises of warrants, shares 195,974 38,017 1,092,437
Issuance of common stock related to share based compensation, shares 207,468 541,890  
Issuance of common stock related to share based compensation, per shares $ 45.11 $ 43.46  
Common stock, shares repurchase 15,533,758 5,357,443 6,182,429
Common stock, shares repurchase price per share $ 54.08 $ 41.59 $ 45.15
Treasury stock, shares retired 20,000,000    
Treasury stock, shares retired price per share $ 49.53