Consolidated Statements of Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Stockholders' Equity [Abstract]
Net issuances of shares held in treasury in settlement of stock-based compensation (in shares)	314,953	374,267	456,252
Number of Shares	2,819,081	4,308,418	3,014,131
Repurchases of shares of common stock, average price (in dollars per share)	$ 134.95	$ 163.69	$ 150.77
Retirement of shares held in treasury (in shares)		8,000,000	8,000,000
Retirement of shares held in treasury, average price (in dollars per share)		$ 146.27	$ 111.43