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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers Into Level 3 | $ 18 | $ 141 | $ 72 | $ 212
Transfers Out of Level 3 | (177) | (116) | (300) | (352)
Total | (159) | 25 | (228) | (140)
Corporate bonds |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers Into Level 3 | 0 | 100 | 22 | 159
Transfers Out of Level 3 | (92) | (76) | (136) | (119)
Total | (92) | 24 | (114) | 40
CMBS |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers Into Level 3 | 0 | 4 | 0 | 4
Transfers Out of Level 3 | 0 | 0 | 0 | 0
Total | 0 | 4 | 0 | 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 | 18 | 2 | 50 | 2
Transfers Out of Level 3 | (85) | (40) | (108) | (233)
Total | (67) | (38) | (58) | (231)
Hybrid and redeemable preferred securities |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers Into Level 3 | 0 | 4 | 0 | 16
Transfers Out of Level 3 | 0 | 0 | 0 | 0
Total | 0 | 4 | 0 | 16
Derivative investments |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers Into Level 3 | 0 | 31 | 0 | 31
Transfers Out of Level 3 | 0 | 0 | (51) | 0
Total | $ 0 | $ 31 | $ (51) | $ 31

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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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