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Fair Value Measurements - Fair Value of Financial Instruments on Recurring Basis (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | $ 1,757 |  | $ 1,681
Total assets | 1,778 |  | 2,157
Total liabilities | 21 |  | 476
Corporate debt securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 1,129 |  | 1,123
Mortgage-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 303 |  |
Asset-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 110 |  | 82
Government-sponsored enterprise securities (“GSEs”) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 97 |  | 163
Municipal securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 68 |  | 114
U.S. Treasury notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 40 |  | 181
Foreign securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 7 |  | 4
Certificates of deposit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 3 |  | 14
1.125% Call Option derivative asset |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
1.125% Call Option derivative asset | 21 |  | 476
1.125% Conversion Option derivative liability |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
1.125% Conversion Option derivative liability | $ 21 |  | $ 476
1.125% Call Option |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Percentage of contractual interest rate on derivative | 1.125% | 1.125% | 1.125%
1.125% Conversion Option derivative liability |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Percentage of contractual interest rate on derivative | 1.125% |  | 1.125%
Observable Inputs (Level 1) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | $ 0 |  | $ 0
Total assets | 0 |  | 0
Total liabilities | 0 |  | 0
Observable Inputs (Level 1) | Corporate debt securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 0 |  | 0
Observable Inputs (Level 1) | Mortgage-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 0 |  |
Observable Inputs (Level 1) | Asset-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 0 |  | 0
Observable Inputs (Level 1) | Government-sponsored enterprise securities (“GSEs”) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 0 |  | 0
Observable Inputs (Level 1) | Municipal securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 0 |  | 0
Observable Inputs (Level 1) | U.S. Treasury notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 0 |  | 0
Observable Inputs (Level 1) | Foreign securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 0 |  | 0
Observable Inputs (Level 1) | Certificates of deposit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 0 |  | 0
Observable Inputs (Level 1) | 1.125% Call Option derivative asset |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
1.125% Call Option derivative asset | 0 |  | 0
Observable Inputs (Level 1) | 1.125% Conversion Option derivative liability |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
1.125% Conversion Option derivative liability | 0 |  | 0
Directly or Indirectly Observable Inputs (Level 2) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 1,757 |  | 1,681
Total assets | 1,757 |  | 1,681
Total liabilities | 0 |  | 0
Directly or Indirectly Observable Inputs (Level 2) | Corporate debt securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 1,129 |  | 1,123
Directly or Indirectly Observable Inputs (Level 2) | Mortgage-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 303 |  |
Directly or Indirectly Observable Inputs (Level 2) | Asset-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 110 |  | 82
Directly or Indirectly Observable Inputs (Level 2) | Government-sponsored enterprise securities (“GSEs”) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 97 |  | 163
Directly or Indirectly Observable Inputs (Level 2) | Municipal securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 68 |  | 114
Directly or Indirectly Observable Inputs (Level 2) | U.S. Treasury notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 40 |  | 181
Directly or Indirectly Observable Inputs (Level 2) | Foreign securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 7 |  | 4
Directly or Indirectly Observable Inputs (Level 2) | Certificates of deposit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 3 |  | 14
Directly or Indirectly Observable Inputs (Level 2) | 1.125% Call Option derivative asset |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
1.125% Call Option derivative asset | 0 |  | 0
Directly or Indirectly Observable Inputs (Level 2) | 1.125% Conversion Option derivative liability |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
1.125% Conversion Option derivative liability | 0 |  | 0
Unobservable Inputs (Level 3) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 0 |  | 0
Total assets | 21 |  | 476
Total liabilities | 21 |  | 476
Unobservable Inputs (Level 3) | Corporate debt securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 0 |  | 0
Unobservable Inputs (Level 3) | Mortgage-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 0 |  |
Unobservable Inputs (Level 3) | Asset-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 0 |  | 0
Unobservable Inputs (Level 3) | Government-sponsored enterprise securities (“GSEs”) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 0 |  | 0
Unobservable Inputs (Level 3) | Municipal securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 0 |  | 0
Unobservable Inputs (Level 3) | U.S. Treasury notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 0 |  | 0
Unobservable Inputs (Level 3) | Foreign securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 0 |  | 0
Unobservable Inputs (Level 3) | Certificates of deposit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 0 |  | 0
Unobservable Inputs (Level 3) | 1.125% Call Option derivative asset |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
1.125% Call Option derivative asset | 21 |  | 476
Unobservable Inputs (Level 3) | 1.125% Conversion Option derivative liability |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
1.125% Conversion Option derivative liability | $ 21 |  | $ 476

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