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Related Party Transactions - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended	12 Months Ended
	Jul. 26, 2019	Apr. 30, 2019	Dec. 31, 2019	Jul. 25, 2019	Jul. 12, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Common stock, voting power percentage	50.00%		50.00%
Common stock, Shares outstanding					136,832,712
Long-term investments and other assets			$ 796			$ 778
Airplane Two \| Expedia, Inc
Related Party Transaction [Line Items]
Airplane ownership interest			50.00%
Airplane Two \| Iac
Related Party Transaction [Line Items]
Airplane ownership interest			50.00%
New Airplane
Related Party Transaction [Line Items]
Related party transaction, expected costs of transaction		$ 72
Related party costs			$ 23
Flight Equipment
Related Party Transaction [Line Items]
Long-term investments and other assets			$ 53			$ 33
Liberty Expedia Holdings
Related Party Transaction [Line Items]
Ownership Interest, In Shares				11,076,672
Common stock, voting power percentage	20.00%			53.00%
The Malone Group
Related Party Transaction [Line Items]
Common stock, voting power percentage		32.00%
Common Class B
Related Party Transaction [Line Items]
Common stock, Shares outstanding			5,523,452		12,799,999	12,799,999
Common stock, par value (in dollars per share)			$ 0.0001			$ 0.0001
Conversion of stock, shares issued	5,523,452		5,500,000
Common Class B \| Liberty Expedia Holdings
Related Party Transaction [Line Items]
Ownership Interest, In Shares				12,799,999
Common Class B \| Liberty Expedia Holdings, LEMS I LLC
Related Party Transaction [Line Items]
Common stock, par value (in dollars per share)	$ 0.01
Common Class A \| Liberty Expedia Holdings, LEMS I LLC
Related Party Transaction [Line Items]
Common stock, par value (in dollars per share)	$ 0.01
Common stock
Related Party Transaction [Line Items]
Conversion of stock, shares issued			137,000,000
Liberty Expedia Holdings transaction, shares issued (in shares)	20,700,000
Common stock, expected shares outstanding			137,000,000
Agreement And Plan Of Merger
Related Party Transaction [Line Items]
Conversion of stock, shares issued	0.36
Second Amended And Restated Governance Agreement Exchange With The Company Option
Related Party Transaction [Line Items]
Conversion Of stock, future exchange rights, maximum share amount	12,799,999
Common stock, expected shares outstanding	130,000,000
Second Amended And Restated Governance Agreement Purchase From The Company Option
Related Party Transaction [Line Items]
Common stock, expected shares outstanding	137,000,000
Board of Directors Chairman \| The Diller Foundation d/b/a The Diller - von Furstenberg Family Foundation
Related Party Transaction [Line Items]
Common stock, voting power percentage			29.00%
Board of Directors Chairman \| Common Class B \| The Diller Foundation d/b/a The Diller - von Furstenberg Family Foundation
Related Party Transaction [Line Items]
Common stock, voting power percentage			29.00%
Board of Directors Chairman \| Second Amended And Restated Governance Agreement \| Common Class B
Related Party Transaction [Line Items]
Common stock, voting power percentage	50.00%
Conversion Of stock, future exchange rights, maximum share amount	7,276,547
Board of Directors Chairman \| Second Amended And Restated Governance Agreement Purchase From The Company Option \| The Diller Foundation d/b/a The Diller - von Furstenberg Family Foundation
Related Party Transaction [Line Items]
Common stock, voting power percentage	48.00%
Board of Directors Chairman \| Second Amended And Restated Governance Agreement Purchase From The Company Option \| Common Class B \| The Diller Foundation d/b/a The Diller - von Furstenberg Family Foundation
Related Party Transaction [Line Items]
Conversion Of stock, future exchange rights, maximum share amount	12,799,999
Board of Directors Chairman \| Exchange Agreement \| The Diller Foundation d/b/a The Diller - von Furstenberg Family Foundation
Related Party Transaction [Line Items]
Conversion of stock, shares issued			5,500,000
Maximum \| Board of Directors Chairman \| Common Class B \| The Diller Foundation d/b/a The Diller - von Furstenberg Family Foundation
Related Party Transaction [Line Items]
Common stock, voting power percentage	5.00%