Segment Information - Contract Balances (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | |||||
|---|---|---|---|---|---|---|---|
Sep. 30, 2021 |
Sep. 30, 2020 |
Sep. 30, 2021 |
Sep. 30, 2020 |
Jan. 01, 2021 |
Dec. 31, 2020 |
Jan. 01, 2020 |
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| Segment Information | |||||||
| Accounts receivable | $ 151 | $ 151 | $ 70 | ||||
| Contract assets | 47 | 47 | 13 | ||||
| Total | 198 | 198 | $ 83 | ||||
| Deferred revenue | $ 28 | $ 62 | |||||
| Contract with customer revenue recognized | $ 4 | $ 5 | 21 | $ 49 | |||
| Amount of revenue refunded | $ 1 | $ 3 | $ 11 | ||||
| X | ||||||||||
- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business. No definition available.
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| X | ||||||||||
- Definition The amount of revenue refunded due to cancellations by travelers during the period. No definition available.
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| X | ||||||||||
- Definition Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- References No definition available.
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