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Fair Value Measurements - Financial Instruments on a Recurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | $ 1,946 | $ 1,681
Total assets | 1,975 | 2,157
Total liabilities | 29 | 476
Corporate debt securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 1,178 | 1,123
Mortgage-backed securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 420 |
Asset-backed securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 127 | 82
U.S. Treasury notes |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 86 | 181
Municipal securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 78 | 114
Government-sponsored enterprise securities (“GSEs”) |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 49 | 163
Foreign securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 7 | 4
Certificates of deposit |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 1 | 14
1.125% Call Option derivative asset |  |
Fair value of assets measured on recurring basis |  |
1.125% Call Option derivative asset | $ 29 | 476
Percentage of contractual interest rate on derivative | 1.125% |
Conversion Option |  |
Fair value of assets measured on recurring basis |  |
1.125% Conversion Option derivative liability | $ 29 | 476
Percentage of contractual interest rate on derivative | 1.125% |
Level 1 |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | $ 0 | 0
Total assets | 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 |
Level 1 | Asset-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 | Municipal securities |  |
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 | 0
Level 1 | Foreign 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 | 0
Level 1 | 1.125% Call Option derivative asset |  |
Fair value of assets measured on recurring basis |  |
1.125% Call Option derivative asset | 0 | 0
Level 1 | Conversion Option |  |
Fair value of assets measured on recurring basis |  |
1.125% Conversion Option derivative liability | 0 | 0
Level 2 |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 1,946 | 1,681
Total assets | 1,946 | 1,681
Total liabilities | 0 | 0
Level 2 | Corporate debt securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 1,178 | 1,123
Level 2 | Mortgage-backed securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 420 |
Level 2 | Asset-backed securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 127 | 82
Level 2 | U.S. Treasury notes |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 86 | 181
Level 2 | Municipal securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 78 | 114
Level 2 | Government-sponsored enterprise securities (“GSEs”) |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 49 | 163
Level 2 | Foreign securities |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 7 | 4
Level 2 | Certificates of deposit |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 1 | 14
Level 2 | 1.125% Call Option derivative asset |  |
Fair value of assets measured on recurring basis |  |
1.125% Call Option derivative asset | 0 | 0
Level 2 | Conversion Option |  |
Fair value of assets measured on recurring basis |  |
1.125% Conversion Option derivative liability | 0 | 0
Level 3 |  |
Fair value of assets measured on recurring basis |  |
Debt securities, available-for-sale | 0 | 0
Total assets | 29 | 476
Total liabilities | 29 | 476
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 |
Level 3 | Asset-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 | Municipal securities |  |
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 | 0
Level 3 | Foreign 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 | 0
Level 3 | 1.125% Call Option derivative asset |  |
Fair value of assets measured on recurring basis |  |
1.125% Call Option derivative asset | 29 | 476
Level 3 | Conversion Option |  |
Fair value of assets measured on recurring basis |  |
1.125% Conversion Option derivative liability | $ 29 | $ 476

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