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Consolidated Statements of Equity (Parenthetical) - $ / shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement of Stockholders' Equity [Abstract]      
Issuance of common stock related to exercises of warrants (in shares)   205,526 195,974
Issuance of shares held in treasury in settlement of stock-based compensation (in shares) 807,015 868,746 207,468
Issuance of shares held in treasury in settlement of stock-based compensation, average price (in dollars per share) $ 113.38 $ 50.19 $ 45.11
Repurchase of common stock (in shares) 4,366,365 3,805,114 15,533,758
Repurchase of common stock, average price (in dollars per share) $ 111.62 $ 93.52 $ 54.08
Retirement of shares held in treasury (in shares)   8,000,000 20,000,000
Retirement of shares held in treasury, average price (in dollars per share)   $ 64.98 $ 49.53