Quarterly Financial Information (Unaudited) - Schedule of Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 920	$ 1,504	$ 566	$ 2,209	$ 2,747	$ 3,558	$ 3,153	$ 2,609	$ 5,199	$ 12,067	$ 11,223
Operating income (loss)	(463)	(113)	(849)	(1,294)	160	609	265	(131)	(2,719)	903	714
Net income (loss) attributable to Expedia Group, Inc. common stockholders	$ (412)	$ (221)	$ (753)	$ (1,301)	$ 76	$ 409	$ 183	$ (103)	$ (2,687)	$ 565	$ 406
Basic (in dollars per share)	$ (2.89)	$ (1.56)	$ (5.34)	$ (9.24)	$ 0.52	$ 2.77	$ 1.23	$ (0.69)	$ (19.00)	$ 3.84	$ 2.71
Diluted (in dollars per share)	$ (2.89)	$ (1.56)	$ (5.34)	$ (9.24)	$ 0.52	$ 2.71	$ 1.21	$ (0.69)	$ (19.00)	$ 3.77	$ 2.65