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Fair Value Measurements - Financial Instruments on a Recurring Basis (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | $ 4,226 | $ 4,325
Total assets | 4,226 | 4,325
Corporate debt securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 2,600 | 2,744
Mortgage-backed securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 982 | 914
Asset-backed securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 396 | 431
Municipal securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 178 | 183
U.S. Treasury notes |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 22 | 5
Other |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 48 | 48
(Level 1) |  |
Fair value of assets measured on recurring basis |  |
Total assets | 0 | 0
(Level 1) | Corporate debt securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 0 | 0
(Level 1) | Mortgage-backed securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 0 | 0
(Level 1) | Asset-backed securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 0 | 0
(Level 1) | Municipal securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 0 | 0
(Level 1) | U.S. Treasury notes |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 0 | 0
(Level 1) | Other |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 0 | 0
(Level 2) |  |
Fair value of assets measured on recurring basis |  |
Total assets | 4,226 | 4,325
(Level 2) | Corporate debt securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 2,600 | 2,744
(Level 2) | Mortgage-backed securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 982 | 914
(Level 2) | Asset-backed securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 396 | 431
(Level 2) | Municipal securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 178 | 183
(Level 2) | U.S. Treasury notes |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 22 | 5
(Level 2) | Other |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 48 | 48
(Level 3) |  |
Fair value of assets measured on recurring basis |  |
Total assets | 0 | 0
(Level 3) | Corporate debt securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 0 | 0
(Level 3) | Mortgage-backed securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 0 | 0
(Level 3) | Asset-backed securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 0 | 0
(Level 3) | Municipal securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 0 | 0
(Level 3) | U.S. Treasury notes |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 0 | 0
(Level 3) | Other |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | $ 0 | $ 0

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- Definition Fair value portion of asset recognized for present right to economic benefit. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
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