CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Total revenues	$ 10,958	$ 6,796	$ 15,066
Operating expenses:
Marketing expenses	3,801	2,179	4,967
Sales and other expenses	881	755	955
Personnel, including stock-based compensation of $370, $233, and $308, respectively	2,314	1,944	2,248
General and administrative	620	581	797
Information technology	412	299	285
Depreciation and amortization	421	458	469
Restructuring and other exit costs	13	149	0
Impairment of goodwill	0	1,062	0
Total operating expenses	8,462	7,427	9,721
Operating income (loss)	2,496	(631)	5,345
Interest expense	(334)	(356)	(266)
Other income (expense), net	(697)	1,554	879
Income before income taxes	1,465	567	5,958
Income tax expense	300	508	1,093
Net income	$ 1,165	$ 59	$ 4,865
Net income applicable to common stockholders per basic common share	$ 28.39	$ 1.45	$ 112.93
Weighted-average number of basic common shares outstanding (in shares)	41,042	40,974	43,082
Net income applicable to common stockholders per diluted common share	$ 28.17	$ 1.44	$ 111.82
Weighted-average number of diluted common shares outstanding (in shares)	41,362	41,160	43,509
Agency revenues
Total revenues	$ 6,663	$ 4,314	$ 10,117
Merchant revenues
Total revenues	3,696	2,117	3,830
Advertising and other revenues
Total revenues	$ 599	$ 365	$ 1,119