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Fair Value of Financial Instruments - Changes in Unrealized Gains (Losses) Included in OCI (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Fair Value Assets and Liabilities Measured on Recurring Basis Level 3 Activity [Line Items] |  |  |
Unrealized gains (losses) included in OCI, net | $ (36) | $ 4 | $ (1,713)
Corporate bonds |  |  |
Fair Value Assets and Liabilities Measured on Recurring Basis Level 3 Activity [Line Items] |  |  |
Unrealized gains (losses) included in OCI, net | (37) | (5) | (1,562)
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 | 3 | (1)
Foreign government bonds |  |  |
Fair Value Assets and Liabilities Measured on Recurring Basis Level 3 Activity [Line Items] |  |  |
Unrealized gains (losses) included in OCI, net | 0 | 0 | (7)
ABS |  |  |
Fair Value Assets and Liabilities Measured on Recurring Basis Level 3 Activity [Line Items] |  |  |
Unrealized gains (losses) included in OCI, net | (3) | 3 | (116)
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 | 2 | (1) | (22)
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 | $ 2 | $ 4 | $ (5)

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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/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: 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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