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Fair Value of Financial Instruments - Components of the Transfers In and Out of Level 3 (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers Into Level 3 | $ 20 | $ 54 | $ 92 | $ 266
Transfers Out of Level 3 | (210) | (210) | (510) | (562)
Total | (190) | (156) | (418) | (296)
Corporate bonds |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers Into Level 3 | 0 | 36 | 22 | 195
Transfers Out of Level 3 | (7) | (79) | (143) | (198)
Total | (7) | (43) | (121) | (3)
RMBS |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers Into Level 3 | 0 | 12 | 0 | 12
Transfers Out of Level 3 | (5) | (5) | (5) | (5)
Total | (5) | 7 | (5) | 7
CMBS |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers Into Level 3 | 0 | 0 | 0 | 4
Transfers Out of Level 3 | (16) | 0 | (16) | 0
Total | (16) | 0 | (16) | 4
State and municipal bonds |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers Into Level 3 |  |  | 0 | 0
Transfers Out of Level 3 |  |  | (5) | 0
Total |  |  | (5) | 0
ABS |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers Into Level 3 | 0 | 0 | 50 | 2
Transfers Out of Level 3 | (178) | (113) | (286) | (346)
Total | (178) | (113) | (236) | (344)
Hybrid and redeemable preferred securities |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers Into Level 3 | 10 | 0 | 10 | 16
Transfers Out of Level 3 | 0 | (13) | 0 | (13)
Total | 10 | (13) | 10 | 3
Trading securities |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers Into Level 3 | 0 | 6 | 0 | 6
Transfers Out of Level 3 | 0 | 0 | 0 | 0
Total | 0 | 6 | 0 | 6
Equity securities |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers Into Level 3 | 0 | 0 | 0 | 0
Transfers Out of Level 3 | (4) | 0 | (4) | 0
Total | (4) | 0 | (4) | 0
Derivative investments |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers Into Level 3 |  |  | 0 | 31
Transfers Out of Level 3 |  |  | (51) | 0
Total |  |  | (51) | 31
Other investments |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers Into Level 3 | 10 | 0 | 10 | 0
Transfers Out of Level 3 | 0 | 0 | 0 | 0
Total | $ 10 | $ 0 | $ 10 | $ 0

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- Definition Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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- Definition Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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