Statement of Changes in Equity (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Mar. 20, 2020	Mar. 31, 2020	Mar. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		$ 837,656	$ 551,519
Shares issued under stock-based compensation plans		0	0
Stock-based compensation expense		53,568	63,475
Temporary equity reclassification			6,947
Common stock issued under employee stock purchase plan		21,034	19,015
Stock repurchases, net		(199,903)	(93,805)
Restricted shares turned in for tax withholding		(65,343)	(60,106)
Cash dividends declared		(42,839)	(46,024)
Accelerated stock repurchase program		(1,000,000)
Cumulative-effect adjustment from adoption of accounting standard		(1,641)	838
Other comprehensive income, net of tax		(2,683)	2,671
Net income		181,222	110,348
Ending balance		$ (218,929)	$ 554,878
Beginning balance, treasury shares (in shares)		(188,693,000)
Restricted shares turned in for tax withholding (in shares)		(483,224)	(593,988)
Accelerated stock repurchases (in shares)		(6,528,000)
Ending balance, treasury shares (in shares)		(197,436,000)
Cash dividend paid (in dollars per share)	$ 0.35
Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)		318,760,000	309,761,000
Shares issued under stock compensation plans (shares)		1,432,000	1,755,000
Common stock issued under employee stock purchase plan (shares)		245,000	216,000
Ending balance (in shares)		320,437,000	311,732,000
Beginning balance		$ 319	$ 310
Shares issued under stock-based compensation plans		1	2
Ending balance		320	312
Additional Paid-in Capital [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		6,249,065	5,404,500
Shares issued under stock-based compensation plans		(1)	(2)
Stock-based compensation expense		53,568	63,475
Temporary equity reclassification			6,947
Common stock issued under employee stock purchase plan		21,034	19,015
Accelerated stock repurchase program		(200,000)
Other		1,923	2,000
Ending balance		6,125,589	5,495,935
Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		4,660,145	4,169,019
Cash dividends declared			(46,024)
Cumulative-effect adjustment from adoption of accounting standard		(1,641)	838
Other		(1,923)	(2,000)
Net income		181,222
Ending balance		4,794,964	4,232,181
Accumulated Other Comprehensive Loss [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		(5,127)	(8,154)
Other comprehensive income, net of tax		(2,683)	2,671
Ending balance		(7,810)	(5,483)
Common Stock in Treasury [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		(10,066,746)	(9,014,156)
Stock repurchases, net		(199,903)	(93,805)
Restricted shares turned in for tax withholding		(65,343)	(60,106)
Accelerated stock repurchase program		(800,000)
Ending balance		$ (11,131,992)	$ (9,168,067)
Beginning balance, treasury shares (in shares)		(188,693,000)	(178,327,000)
Stock repurchases net (shares)		(1,732,000)	(911,000)
Restricted shares turned in for tax withholding (in shares)		(483,000)	(594,000)
Ending balance, treasury shares (in shares)		(197,436,000)	(179,832,000)