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Investments - Summary of Investments (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 4,494 | $ 4,367
Gross Unrealized Gains | 54 | 21
Gross Unrealized Losses | 66 | 129
Estimated Fair Value | 4,482 | 4,259
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,837 | 2,781
Gross Unrealized Gains | 37 | 16
Gross Unrealized Losses | 26 | 65
Estimated Fair Value | 2,848 | 2,732
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 963 | 951
Gross Unrealized Gains | 11 | 4
Gross Unrealized Losses | 29 | 44
Estimated Fair Value | 945 | 911
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 441 | 376
Gross Unrealized Gains | 3 | 1
Gross Unrealized Losses | 6 | 12
Estimated Fair Value | 438 | 365
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 197 | 172
Gross Unrealized Gains | 2 | 0
Gross Unrealized Losses | 4 | 6
Estimated Fair Value | 195 | 166
U.S. Treasury notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 5 | 40
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 5 | 40
Other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 51 | 47
Gross Unrealized Gains | 1 | 0
Gross Unrealized Losses | 1 | 2
Estimated Fair Value | $ 51 | $ 45

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