Dismissal findings.

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Loss Contingency, Estimate of Possible Loss, Additions

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Commitments and Contingencies - Additional Information (Detail) $ in Millions, $ in Millions		3 Months Ended
	Apr. 22, 2022 AUD ($)	Mar. 31, 2022 USD ($) lawsuit	Dec. 31, 2021 USD ($)
Litigation relating to occupancy tax
Commitment And Contingencies [Line Items]
Number of lawsuits filed \| lawsuit		103
Number of lawsuits currently active \| lawsuit		8
Number of lawsuits dismissed to date \| lawsuit		49
Number of dismissals based on finding that defendant was not subject to local hotel occupancy tax or the local government lacked standing to pursue claims \| lawsuit		34
Reserve for legal contingencies \| $		$ 48	$ 50
Breach of Australian consumer law \| Affiliated Entity
Commitment And Contingencies [Line Items]
Estimated probable loss \| $		34	$ 11
Estimate of possible loss, additions \| $		$ 23
Breach of Australian consumer law \| Subsequent Event \| Affiliated Entity
Commitment And Contingencies [Line Items]
Trivago to pay penalty \| $	$ 44.7