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Fair Value Measurements - Financial Instruments on a Recurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | $ 3,202 | $ 1,875
Total assets | 3,202 | 1,875
Contingent consideration liabilities | 47 | 46
Total liabilities | 47 | 46
Corporate debt securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 1,833 | 1,256
Mortgage-backed securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 614 | 392
U.S. Treasury notes |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 353 | 27
Asset-backed securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 247 | 132
Municipal securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 123 | 68
Other |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 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 | U.S. Treasury notes |  |
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 | Other |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 0 |
Level 2 |  |
Fair value of assets measured on recurring basis |  |
Total assets | 3,202 | 1,875
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 | 1,833 | 1,256
Level 2 | Mortgage-backed securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 614 | 392
Level 2 | U.S. Treasury notes |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 353 | 27
Level 2 | Asset-backed securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 247 | 132
Level 2 | Municipal securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 123 | 68
Level 2 | Other |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 32 |
Level 3 |  |
Fair value of assets measured on recurring basis |  |
Total assets | 0 | 0
Contingent consideration liabilities | 47 | 46
Total liabilities | 47 | 46
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 | U.S. Treasury notes |  |
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 | Other |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | $ 0 |

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