Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Revenues	$ 6,435,637	$ 5,244,905	$ 18,351,614	$ 14,689,013
Cost of revenues	3,867,751	3,097,919	11,111,159	8,974,190
Marketing	527,597	553,797	1,465,797	1,773,525
Technology and development	453,802	379,776	1,342,664	1,135,773
General and administrative	271,624	233,174	800,947	659,783
Operating income	1,314,863	980,239	3,631,047	2,145,742
Other income (expense):
Interest expense	(197,079)	(160,660)	(570,313)	(448,222)
Interest and other income (expense)	(256,324)	192,744	(367,802)	215,378
Income before income taxes	861,460	1,012,323	2,692,932	1,912,898
Provision for income taxes	71,484	347,079	473,693	632,952
Net income	$ 789,976	$ 665,244	$ 2,219,239	$ 1,279,946
Earnings per share:
Basic (in dollars per share)	$ 1.79	$ 1.52	$ 5.04	$ 2.93
Diluted (in dollars per share)	$ 1.74	$ 1.47	$ 4.89	$ 2.83
Weighted-average common shares outstanding:
Basic (in shares)	441,526	438,090	440,486	437,547
Diluted (in shares)	455,088	451,552	453,846	451,896