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Fair Value Measurements - Financial Instruments on a Recurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | $ 4,259 | $ 3,499
Total assets | 4,259 | 3,499
Contingent consideration liabilities |  | 8
Total liabilities |  | 8
Corporate debt securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 2,732 | 2,184
Mortgage-backed securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 911 | 731
Asset-backed securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 365 | 288
Municipal securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 166 | 149
U.S. Treasury notes |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 40 | 105
Other |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 45 | 42
Level 1 |  |
Fair value of assets measured on recurring basis |  |
Total assets | 0 | 0
Contingent consideration liabilities |  | 0
Total liabilities |  | 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 | 4,259 | 3,499
Contingent consideration liabilities |  | 0
Total liabilities |  | 0
Level 2 | Corporate debt securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 2,732 | 2,184
Level 2 | Mortgage-backed securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 911 | 731
Level 2 | Asset-backed securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 365 | 288
Level 2 | Municipal securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 166 | 149
Level 2 | U.S. Treasury notes |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 40 | 105
Level 2 | Other |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 45 | 42
Level 3 |  |
Fair value of assets measured on recurring basis |  |
Total assets | 0 | 0
Contingent consideration liabilities |  | 8
Total liabilities |  | 8
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 probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -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 of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 805 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479581/805-30-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479668/805-30-25-6 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 35 -Paragraph 1 -Subparagraph (b) -SubTopic 30 -Topic 805 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479613/805-30-35-1 + Details
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