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Consolidated Statements of Equity (Parenthetical) - $ / shares | 12 Months Ended
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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

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