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Investments - Schedule of Investments (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 3,709 | $ 3,208
Gross Unrealized Gains | 2 | 12
Gross Unrealized Losses | 212 | 18
Estimated Fair Value | 3,499 | 3,202
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,303 | 1,836
Gross Unrealized Gains | 2 | 9
Gross Unrealized Losses | 121 | 12
Estimated Fair Value | 2,184 | 1,833
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 787 | 616
Gross Unrealized Gains | 0 | 2
Gross Unrealized Losses | 56 | 4
Estimated Fair Value | 731 | 614
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 308 | 248
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 20 | 1
Estimated Fair Value | 288 | 247
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 160 | 123
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | 11 | 1
Estimated Fair Value | 149 | 123
U.S. Treasury notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 106 | 353
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 1 | 0
Estimated Fair Value | 105 | 353
Other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 45 | 32
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 3 | 0
Estimated Fair Value | $ 42 | $ 32

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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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