Stock-Based Compensation - Grants of stock options (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
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| Stock-Based Compensation | ||||
| Stock-based compensation | $ 6 | $ 7 | $ 17 | $ 15 |
| Series C | ||||
| Stock-Based Compensation | ||||
| Options granted | 181 | |||
| Series A | ||||
| Stock-Based Compensation | ||||
| Options granted | 0 | |||
| Series B | ||||
| Stock-Based Compensation | ||||
| Options granted | 0 | |||
| Employee Stock Option | ||||
| Stock-Based Compensation | ||||
| Dividend rate | 0.00% | |||
| Subsidiary employees | Employee Stock Option | Series C | ||||
| Stock-Based Compensation | ||||
| Options granted | 181 | |||
| Vesting period | 5 years | |||
| Weighted average GDFV | $ 26.4 | |||
| Subsidiary employees | Time-based RSU | Series C | ||||
| Stock-Based Compensation | ||||
| Award granted (in shares) | 72 | |||
| RSUs GDFV | $ 88.65 | |||
| Subsidiary employees | Performance based RSUs | Series C | ||||
| Stock-Based Compensation | ||||
| Award granted (in shares) | 153 | |||
| RSUs GDFV | $ 105.1 | |||
| X | ||||||||||
- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition 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. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition 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. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Net number of share options (or share units) granted during the period. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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