Revenue from Contracts with Customers - Disaggregated Revenue by Nature of Service (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenue from Contracts with Customers
Total revenue	$ 674	$ 597	$ 1,926	$ 1,832
Travel revenue
Revenue from Contracts with Customers
Total revenue	528	478	1,534	1,476
Product and professional services revenue
Revenue from Contracts with Customers
Total revenue	$ 146	$ 119	$ 392	$ 356

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.

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+ Details

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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