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Stockholders’ Equity - Share-Based Payment Arrangement, Expensed and Capitalized, Amount (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 21, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Total stock-based compensation expense | $ 2,581 | $ 69 | $ 2,605 | $ 214 | $ 2,614
Share-based payment arrangement, amount capitalized | $ 39 | (9) | (41) | (27) | (41)
Non-voting common stock withheld or cancelled for tax obligation and net settlement (in shares) | 20,810,882 |  |  |  |
Options (in shares) | 43,052,572 |  |  |  |
Shares issued in period (in shares) | 22,241,690 |  |  |  |
Taxes paid related to net share settlement of equity awards |  |  | 570 | 92 | 570
IPO |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Sale of stock, price per share (in dollars per share) | $ 30.00 |  |  |  |
Cost of revenue |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Total stock-based compensation expense |  | 2 | 17 | 6 | 17
Operations and support |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Total stock-based compensation expense |  | 4 | 85 | 9 | 85
Employee benefits and share-based compensation |  |  |  | 4 |
Research and development |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Total stock-based compensation expense |  | 45 | 1,711 | 99 | 1,715
Employee benefits and share-based compensation |  |  |  | 79 |
Sales and marketing |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Total stock-based compensation expense |  | 14 | 292 | 46 | 294
Employee benefits and share-based compensation |  |  |  | 8 |
General and administrative |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Total stock-based compensation expense |  | $ 4 | $ 500 | 54 | $ 503
Employee benefits and share-based compensation |  |  |  | $ 4 |

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