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Investments - Available-for-Sale Investments (Details) $ in Millions | Mar. 31, 2022 USD ($) position security | Dec. 31, 2021 USD ($) security position
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value | $ 2,428 | $ 1,706
Unrealized Losses | $ 107 | $ 18
Total Number of Positions | position | 1,091 | 677
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value | $ 1,516 | $ 1,063
Unrealized Losses | $ 67 | $ 12
Total Number of Positions | position | 624 | 395
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value | $ 582 | $ 408
Unrealized Losses | $ 24 | $ 4
Total Number of Positions | position | 238 | 146
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value | $ 208 | $ 166
Unrealized Losses | $ 9 | $ 1
Total Number of Positions | security | 99 | 75
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value | $ 97 | $ 69
Unrealized Losses | $ 6 | $ 1
Total Number of Positions | security | 120 | 61
Other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value | $ 25 | $ 0
Unrealized Losses | $ 1 | $ 0
Total Number of Positions | security | 10 | 0

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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563 + Details
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- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without an allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455 + Details
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