Equity-Based Compensation - Classified Equity-Based Compensation (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Equity based compensation
Total equity-based compensation expense	$ 69	$ 100	$ 136	$ 164
Income Statement Location [Axis]: us-gaap:CostOfGoodsAndServicesSold
Equity based compensation
Total equity-based compensation expense	2	2	3	4
Income Statement Location [Axis]: w:CustomerServiceAndMerchantFees
Equity based compensation
Total equity-based compensation expense	3	4	5	7
Income Statement Location [Axis]: w:SellingTechnologyOperationsGeneralAndAdministrativeExpense
Equity based compensation
Total equity-based compensation expense	$ 64	$ 94	$ 128	$ 153

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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