Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Revenues	$ 7,341,777	$ 6,148,286	$ 14,505,059	$ 11,915,977
Cost of revenues	4,018,008	3,643,707	7,886,519	7,243,408
Marketing	603,973	434,370	1,116,485	938,200
Technology and development	537,321	435,045	1,062,528	888,862
General and administrative	334,845	277,236	632,041	529,323
Operating income	1,847,630	1,357,928	3,807,486	2,316,184
Other income (expense):
Interest expense	(191,322)	(189,151)	(385,762)	(373,234)
Interest and other income (expense)	(62,519)	(133,175)	206,567	(111,478)
Income before income taxes	1,593,789	1,035,602	3,628,291	1,831,472
Provision for income taxes	(240,776)	(315,406)	(568,563)	(402,209)
Net income	$ 1,353,013	$ 720,196	$ 3,059,728	$ 1,429,263
Earnings per share:
Basic (in dollars per share)	$ 3.05	$ 1.63	$ 6.90	$ 3.25
Diluted (in dollars per share)	$ 2.97	$ 1.59	$ 6.72	$ 3.15
Weighted-average shares of common stock outstanding:
Basic (in shares)	443,159	440,569	443,192	439,961
Diluted (in shares)	455,129	453,945	455,385	453,220