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Investments - Summary of Investments (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 3,974 | $ 3,709
Gross unrealized gains | 8 | 2
Gross unrealized losses | 172 | 212
Estimated Fair Value | 3,810 | 3,499
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,428 | 2,303
Gross unrealized gains | 6 | 2
Gross unrealized losses | 99 | 121
Estimated Fair Value | 2,335 | 2,184
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 897 | 787
Gross unrealized gains | 2 | 0
Gross unrealized losses | 48 | 56
Estimated Fair Value | 851 | 731
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 337 | 308
Gross unrealized gains | 0 | 0
Gross unrealized losses | 14 | 20
Estimated Fair Value | 323 | 288
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 160 | 160
Gross unrealized gains | 0 | 0
Gross unrealized losses | 9 | 11
Estimated Fair Value | 151 | 149
U.S. Treasury notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 123 | 106
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 1
Estimated Fair Value | 123 | 105
Other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 29 | 45
Gross unrealized gains | 0 | 0
Gross unrealized losses | 2 | 3
Estimated Fair Value | $ 27 | $ 42

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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- Definition Amortized cost excluding accrued interest, after allowance for credit loss, of 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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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