Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
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| Revenue, Initial Application Period Cumulative Effect Transition [Line Items] | ||
| Customer invoices period | 30 days | |
| Tripadvisor | ||
| Revenue, Initial Application Period Cumulative Effect Transition [Line Items] | ||
| Maximum subscription advertising service contact period | 1 year | |
| Capitalized contract costs | $ 4 | $ 4 |
| Contract cost amortization | $ 1 | $ 1 |
| Customer invoices period | 30 days | |
| Practical expedient, incremental costs | true | |
| Practical expedient, remaining performance obligation | true | |
| X | ||||||||||
- Definition The length of time that customer invoices are generally due after the time of invoicing. No definition available.
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| X | ||||||||||
- Definition The maximum length of the typical subscription advertising services contract. No definition available.
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| X | ||||||||||
- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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| X | ||||||||||
- Definition Indicates (true false) whether practical expedient was elected to recognize incremental cost of obtaining contract as expense when incurred if amortization period would have been one year or less. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Indicates (true false) whether optional exemption was applied not to disclose amount of transaction price allocated to and explanation of expected timing of revenue recognition for remaining performance obligation, when contract has expected duration of one year or less or right to consideration corresponds directly to performance completed. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Details
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