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Fair Value Measurements - Financial Instruments on a Recurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Fair value of assets measured on recurring basis |  |  |
Debt securities, available-for-sale | $ 1,875 |  | $ 1,946
Total assets | 1,875 |  | 1,975
Contingent consideration liabilities | 46 | $ 46 |
Total liabilities | 46 |  | 29
Corporate debt securities |  |  |
Fair value of assets measured on recurring basis |  |  |
Debt securities, available-for-sale | 1,256 |  | 1,178
Mortgage-backed securities |  |  |
Fair value of assets measured on recurring basis |  |  |
Debt securities, available-for-sale | 392 |  | 420
Asset-backed securities |  |  |
Fair value of assets measured on recurring basis |  |  |
Debt securities, available-for-sale | 132 |  | 127
Municipal securities |  |  |
Fair value of assets measured on recurring basis |  |  |
Debt securities, available-for-sale | 68 |  | 78
Certificates of deposit |  |  |
Fair value of assets measured on recurring basis |  |  |
Debt securities, available-for-sale |  |  | 1
U.S. Treasury notes |  |  |
Fair value of assets measured on recurring basis |  |  |
Debt securities, available-for-sale | 27 |  | 86
Government-sponsored enterprise securities (“GSEs”) |  |  |
Fair value of assets measured on recurring basis |  |  |
Debt securities, available-for-sale |  |  | 49
Other |  |  |
Fair value of assets measured on recurring basis |  |  |
Debt securities, available-for-sale |  |  | 7
Call option derivative asset |  |  |
Fair value of assets measured on recurring basis |  |  |
Call option derivative asset |  |  | 29
Conversion option derivative liability |  |  |
Fair value of assets measured on recurring basis |  |  |
Conversion option derivative liability |  |  | 29
Level 1 |  |  |
Fair value of assets measured on recurring basis |  |  |
Debt securities, available-for-sale |  |  | 0
Total assets | 0 |  | 0
Contingent consideration liabilities | 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 | Certificates of deposit |  |  |
Fair value of assets measured on recurring basis |  |  |
Debt securities, available-for-sale |  |  | 0
Level 1 | U.S. Treasury notes |  |  |
Fair value of assets measured on recurring basis |  |  |
Debt securities, available-for-sale | 0 |  | 0
Level 1 | Government-sponsored enterprise securities (“GSEs”) |  |  |
Fair value of assets measured on recurring basis |  |  |
Debt securities, available-for-sale |  |  | 0
Level 1 | Other |  |  |
Fair value of assets measured on recurring basis |  |  |
Debt securities, available-for-sale |  |  | 0
Level 1 | Call option derivative asset |  |  |
Fair value of assets measured on recurring basis |  |  |
Call option derivative asset |  |  | 0
Level 1 | Conversion option derivative liability |  |  |
Fair value of assets measured on recurring basis |  |  |
Conversion option derivative liability |  |  | 0
Level 2 |  |  |
Fair value of assets measured on recurring basis |  |  |
Debt securities, available-for-sale |  |  | 1,946
Total assets | 1,875 |  | 1,946
Contingent consideration liabilities | 0 |  |
Total liabilities | 0 |  | 0
Level 2 | Corporate debt securities |  |  |
Fair value of assets measured on recurring basis |  |  |
Debt securities, available-for-sale | 1,256 |  | 1,178
Level 2 | Mortgage-backed securities |  |  |
Fair value of assets measured on recurring basis |  |  |
Debt securities, available-for-sale | 392 |  | 420
Level 2 | Asset-backed securities |  |  |
Fair value of assets measured on recurring basis |  |  |
Debt securities, available-for-sale | 132 |  | 127
Level 2 | Municipal securities |  |  |
Fair value of assets measured on recurring basis |  |  |
Debt securities, available-for-sale | 68 |  | 78
Level 2 | Certificates of deposit |  |  |
Fair value of assets measured on recurring basis |  |  |
Debt securities, available-for-sale |  |  | 1
Level 2 | U.S. Treasury notes |  |  |
Fair value of assets measured on recurring basis |  |  |
Debt securities, available-for-sale | 27 |  | 86
Level 2 | Government-sponsored enterprise securities (“GSEs”) |  |  |
Fair value of assets measured on recurring basis |  |  |
Debt securities, available-for-sale |  |  | 49
Level 2 | Other |  |  |
Fair value of assets measured on recurring basis |  |  |
Debt securities, available-for-sale |  |  | 7
Level 2 | Call option derivative asset |  |  |
Fair value of assets measured on recurring basis |  |  |
Call option derivative asset |  |  | 0
Level 2 | Conversion option derivative liability |  |  |
Fair value of assets measured on recurring basis |  |  |
Conversion option derivative liability |  |  | 0
Level 3 |  |  |
Fair value of assets measured on recurring basis |  |  |
Debt securities, available-for-sale |  |  | 0
Total assets | 0 |  | 29
Contingent consideration liabilities | 46 |  |
Total liabilities | 46 |  | 29
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 | Certificates of deposit |  |  |
Fair value of assets measured on recurring basis |  |  |
Debt securities, available-for-sale |  |  | 0
Level 3 | U.S. Treasury notes |  |  |
Fair value of assets measured on recurring basis |  |  |
Debt securities, available-for-sale | $ 0 |  | 0
Level 3 | Government-sponsored enterprise securities (“GSEs”) |  |  |
Fair value of assets measured on recurring basis |  |  |
Debt securities, available-for-sale |  |  | 0
Level 3 | Other |  |  |
Fair value of assets measured on recurring basis |  |  |
Debt securities, available-for-sale |  |  | 0
Level 3 | Call option derivative asset |  |  |
Fair value of assets measured on recurring basis |  |  |
Call option derivative asset |  |  | 29
Level 3 | Conversion option derivative liability |  |  |
Fair value of assets measured on recurring basis |  |  |
Conversion option derivative liability |  |  | $ 29

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