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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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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- Definition

Number of shares authorized for issuance under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Redeemable Convertible Preferred Stock, Redeemable Common Stock, and Stockholders’ Equity (Deficit) - 2019 Stock Option Plan and 2025 Equity Incentive Plan (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Jun. 30, 2025	Dec. 31, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares outstanding (in shares)	36,324,000			47,219,000
Granted (in shares)	0	0
Fair value of shares vested	$ 27	$ 32
Intrinsic value of stock options exercised	$ 940	$ 40
Related Party
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares outstanding (in shares)	375,000
2019 And 2025 Plans \| Stock Options \| Minimum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period	3 years
2019 And 2025 Plans \| Stock Options \| Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period	4 years
Expiration period	10 years
2019 Plan \| Stock Options
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of shares authorized (in shares)				73,637,600
Number of shares available for grant (in shares)				3,750,480
2025 Plan \| Stock Options
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of shares available for grant (in shares)	46,370,204
Shares reserved for future issuance (in shares)			50,000,000
Capital shares reserved for future issuance annual increase			5.00%