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Investments - Summary of Investments (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 4,459 | $ 4,367
Gross Unrealized Gains | 9 | 21
Gross Unrealized Losses | 121 | 129
Estimated Fair Value | 4,347 | 4,259
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,852 | 2,781
Gross Unrealized Gains | 6 | 16
Gross Unrealized Losses | 57 | 65
Estimated Fair Value | 2,801 | 2,732
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 967 | 951
Gross Unrealized Gains | 2 | 4
Gross Unrealized Losses | 45 | 44
Estimated Fair Value | 924 | 911
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 392 | 376
Gross Unrealized Gains | 1 | 1
Gross Unrealized Losses | 10 | 12
Estimated Fair Value | 383 | 365
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 193 | 172
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 7 | 6
Estimated Fair Value | 186 | 166
U.S. Treasury notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 9 | 40
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 9 | 40
Other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 46 | 47
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 2 | 2
Estimated Fair Value | $ 44 | $ 45

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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