Earnings Per Share - Basic and Diluted earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net income attributable to Expedia Group, Inc.	$ 76	$ 409	$ 183	$ (103)	$ 17	$ 525	$ 1	$ (137)	$ 565	$ 406	$ 378
Basic (in dollars per share)	$ 0.52	$ 2.77	$ 1.23	$ (0.69)	$ 0.11	$ 3.51	$ 0.01	$ (0.91)	$ 3.84	$ 2.71	$ 2.49
Diluted (in dollars per share)	$ 0.52	$ 2.71	$ 1.21	$ (0.69)	$ 0.11	$ 3.43	$ 0.01	$ (0.91)	$ 3.77	$ 2.65	$ 2.42
Weighted average number of shares outstanding (000's):
Basic (in shares)									147,194	149,961	151,619
Dilutive effect of:
Options to purchase common stock (in shares)									1,873	2,317	4,218
Other dilutive securities (in shares)									817	611	548
Diluted (in shares)									149,884	152,889	156,385