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Investments - Schedule of Investments (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 3,208 | $ 1,826
Gross Unrealized Gains | 12 | 50
Gross Unrealized Losses | 18 | 1
Estimated Fair Value | 3,202 | 1,875
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,836 | 1,220
Gross Unrealized Gains | 9 | 36
Gross Unrealized Losses | 12 | 0
Estimated Fair Value | 1,833 | 1,256
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 616 | 383
Gross Unrealized Gains | 2 | 10
Gross Unrealized Losses | 4 | 1
Estimated Fair Value | 614 | 392
U.S. Treasury notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 353 | 27
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 353 | 27
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 248 | 130
Gross Unrealized Gains | 0 | 2
Gross Unrealized Losses | 1 | 0
Estimated Fair Value | 247 | 132
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 123 | 66
Gross Unrealized Gains | 1 | 2
Gross Unrealized Losses | 1 | 0
Estimated Fair Value | 123 | $ 68
Other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 32 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Estimated Fair Value | $ 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 http://asc.fasb.org/extlink&oid=123581744&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 http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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