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Fair Value Measurements - Financial Instruments on a Recurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | $ 3,499 | $ 3,202
Total assets | 3,499 | 3,202
Contingent consideration liabilities | 8 | 47
Total liabilities | 8 | 47
Corporate debt securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 2,184 | 1,833
Mortgage-backed securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 731 | 614
Asset-backed securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 288 | 247
Municipal securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 149 | 123
U.S. Treasury notes |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 105 | 353
Other |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 42 | 32
Level 1 |  |
Fair value of assets measured on recurring basis |  |
Total assets | 0 | 0
Contingent consideration liabilities | 0 | 0
Total liabilities | 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 | 3,499 | 3,202
Contingent consideration liabilities | 0 | 0
Total liabilities | 0 | 0
Level 2 | Corporate debt securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 2,184 | 1,833
Level 2 | Mortgage-backed securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 731 | 614
Level 2 | Asset-backed securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 288 | 247
Level 2 | Municipal securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 149 | 123
Level 2 | U.S. Treasury notes |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 105 | 353
Level 2 | Other |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 42 | 32
Level 3 |  |
Fair value of assets measured on recurring basis |  |
Total assets | 0 | 0
Contingent consideration liabilities | 8 | 47
Total liabilities | 8 | 47
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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