Stockholders’ Equity - Schedule of Share-Based Payment Arrangement, Expensed and Capitalized, Amount (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total stock-based compensation expense	$ 142	$ 105	$ 221	$ 172
Income Statement Location [Axis]: us-gaap:CostOfGoodsAndServicesSold
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total stock-based compensation expense	3	2	5	4
Income Statement Location [Axis]: us-gaap:GeneralAndAdministrativeExpense
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total stock-based compensation expense	27	23	46	38
Income Statement Location [Axis]: us-gaap:ResearchAndDevelopmentExpense
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total stock-based compensation expense	84	58	130	92
Income Statement Location [Axis]: us-gaap:SellingAndMarketingExpense
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total stock-based compensation expense	22	18	31	30
Income Statement Location [Axis]: cart:OperationsAndSupportExpense
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total stock-based compensation expense	$ 5	$ 4	$ 8	$ 7

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