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Fair Value of Financial Instruments - Changes in Unrealized Gains (Losses) Included in OCI (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Unrealized gains (losses) included in OCI, net | $ 96 | $ (26) | $ 36 | $ (24)
Corporate bonds |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Unrealized gains (losses) included in OCI, net | 43 | (19) | 2 | (21)
State and municipal bonds |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Unrealized gains (losses) included in OCI, net | 0 | 2 | 0 | 3
RMBS |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Unrealized gains (losses) included in OCI, net | 1 | (1) | 0 | (1)
ABS |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Unrealized gains (losses) included in OCI, net | 47 | (5) | 27 | (4)
Hybrid and redeemable preferred securities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Unrealized gains (losses) included in OCI, net | 1 | 0 | 2 | (2)
Mortgage loans on real estate |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Unrealized gains (losses) included in OCI, net | $ 4 | $ (3) | $ 5 | $ 1

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- Definition Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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