UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Total revenues	$ 4,676	$ 2,640	$ 7,977	$ 5,558
Operating expenses:
Marketing expenses	1,378	731	2,827	1,793
Sales and other expenses	302	129	620	637
Personnel, including stock-based compensation of $85, $80, $284 and $163, respectively	591	517	1,829	1,453
General and administrative	179	148	432	453
Information technology	109	71	289	219
Depreciation and amortization	102	115	323	344
Restructuring and other exit costs	0	41	9	75
Impairment of goodwill	0	573	0	1,062
Total operating expenses	2,661	2,325	6,329	6,036
Operating income (loss)	2,015	315	1,648	(478)
Interest expense	(80)	(98)	(259)	(258)
Other income (expense), net	(967)	618	(740)	1,058
Income before income taxes	968	835	649	322
Income tax expense	199	34	102	98
Net income	$ 769	$ 801	$ 547	$ 224
Net income applicable to common stockholders per basic common share (in dollars per share)	$ 18.73	$ 19.56	$ 13.33	$ 5.46
Weighted-average number of basic common shares outstanding (in shares)	41,068	40,935	41,032	40,983
Net income applicable to common stockholders per diluted common share (in dollars per share)	$ 18.60	$ 19.49	$ 13.22	$ 5.44
Weighted-average number of diluted common shares outstanding (in shares)	41,342	41,081	41,359	41,142
Agency revenues
Total revenues	$ 2,867	$ 1,723	$ 4,912	$ 3,504
Merchant revenues
Total revenues	1,622	837	2,656	1,741
Advertising and other revenues
Total revenues	$ 187	$ 80	$ 409	$ 313