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Investments - Summary of Investments (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 4,328 | $ 3,709
Gross unrealized gains | 1 | 2
Gross unrealized losses | 218 | 212
Estimated Fair Value | 4,111 | 3,499
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,739 | 2,303
Gross unrealized gains | 1 | 2
Gross unrealized losses | 121 | 121
Estimated Fair Value | 2,619 | 2,184
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 955 | 787
Gross unrealized gains | 0 | 0
Gross unrealized losses | 67 | 56
Estimated Fair Value | 888 | 731
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 378 | 308
Gross unrealized gains | 0 | 0
Gross unrealized losses | 17 | 20
Estimated Fair Value | 361 | 288
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 159 | 160
Gross unrealized gains | 0 | 0
Gross unrealized losses | 10 | 11
Estimated Fair Value | 149 | 149
U.S. Treasury notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 51 | 106
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 1
Estimated Fair Value | 51 | 105
Other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 46 | 45
Gross unrealized gains | 0 | 0
Gross unrealized losses | 3 | 3
Estimated Fair Value | $ 43 | $ 42

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