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Stock-Based Compensation - Grants of stock options (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Stock-Based Compensation |  |  |  |
Stock-based compensation | $ 6 | $ 6 | $ 11 | $ 8
Series C common stock |  |  |  |
Stock-Based Compensation |  |  |  |
Options granted |  |  | 181 |
Series B common stock |  |  |  |
Stock-Based Compensation |  |  |  |
Options granted |  |  | 0 |
Series A common stock |  |  |  |
Stock-Based Compensation |  |  |  |
Options granted |  |  | 0 |
Employee Stock Option |  |  |  |
Stock-Based Compensation |  |  |  |
Dividend rate |  |  | 0.00% |
Subsidiary employees | Employee Stock Option | Series C common stock |  |  |  |
Stock-Based Compensation |  |  |  |
Options granted |  |  | 181 |
Vesting period |  |  | 5 years |
Weighted average GDFV |  |  | $ 26.4 |

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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. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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