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