Statement of Changes in Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 112,143	$ 837,656
Beginning balance, treasury shares (in shares)	(199,443,000)
Stock-based compensation expense	$ 86,862	53,568
Common stock issued under employee stock purchase plan	$ 25,757	21,034
Stock repurchases, net		$ (199,903)
Restricted shares turned in for tax withholding (in shares)	(335,347)	(483,224)
Restricted shares turned in for tax withholding	$ (46,745)	$ (65,343)
Cash dividends declared	(45,522)	(42,839)
Value of assumed equity awards related to pre-combination service	28,885
Accelerated stock repurchase program		(1,000,000)
Other comprehensive income, net of tax	(1,736)	(2,683)
Net income	$ 90,048	181,222
Ending balance, treasury shares (in shares)	(199,778,000)
Ending balance	$ 249,692	$ (218,929)
Cash dividend declared (per share)	$ 0.37	$ 0.35
Cumulative Effect, Period of Adoption, Adjustment [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		$ (1,641)
Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	321,964,000	318,760,000
Beginning balance	$ 322	$ 319
Shares issued under stock-based compensation plans (shares)	962,000	1,432,000
Shares issued under stock-based compensation plans	$ 1	$ 1
Common stock issued under employee stock purchase plan (shares)	228,000	245,000
Common stock issued under employee stock purchase plan	$ 0	$ 0
Other (in shares)		0
Ending balance (in shares)	323,154,000	320,437,000
Ending balance	$ 323	$ 320
Additional Paid-in Capital [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	6,608,018	6,249,065
Shares issued under stock-based compensation plans	(1)	(1)
Stock-based compensation expense	86,862	53,568
Common stock issued under employee stock purchase plan	25,757	21,034
Value of assumed equity awards related to pre-combination service	28,885
Accelerated stock repurchase program		(200,000)
Other	2,537	1,923
Ending balance	6,752,058	6,125,589
Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	4,984,333	4,660,145
Cash dividends declared	(45,522)	(42,839)
Other	(2,537)	(1,923)
Net income	90,048	181,222
Ending balance	5,026,322	4,794,964
Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		(1,641)
Accumulated Other Comprehensive Loss [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(3,649)	(5,127)
Other comprehensive income, net of tax	(1,736)	(2,683)
Ending balance	(5,385)	(7,810)
Common Stock in Treasury [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ (11,476,881)	$ (10,066,746)
Beginning balance, treasury shares (in shares)	(199,443,000)	(188,693,000)
Stock repurchases net (in shares)		(1,732,000)
Stock repurchases, net		$ (199,903)
Restricted shares turned in for tax withholding (in shares)	(335,000)	(483,000)
Restricted shares turned in for tax withholding	$ (46,745)	$ (65,343)
Accelerated stock repurchases (in shares)		(6,528,000)
Accelerated stock repurchase program		$ (800,000)
Ending balance, treasury shares (in shares)	(199,778,000)	(197,436,000)
Ending balance	$ (11,523,626)	$ (11,131,992)