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Fair Value Measurements - Financial Instruments on a Recurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | $ 4,325 | $ 4,259
Total assets | 4,325 | 4,259
Corporate debt securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 2,744 | 2,732
Mortgage-backed securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 914 | 911
Asset-backed securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 431 | 365
Municipal securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 183 | 166
U.S. Treasury notes |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 5 | 40
Other |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 48 | 45
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 | 4,325 | 4,259
Level 2 | Corporate debt securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 2,744 | 2,732
Level 2 | Mortgage-backed securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 914 | 911
Level 2 | Asset-backed securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 431 | 365
Level 2 | Municipal securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 183 | 166
Level 2 | U.S. Treasury notes |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 5 | 40
Level 2 | Other |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 48 | 45
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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