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Investments (excluding Consolidated Investment Entities) - Net Gains (Losses) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Realized Gain/(Losses) [Line Items] |  |  |  |
Net gains (losses) | $ (21) | $ (14) | $ (96) | $ 25
Embedded derivatives with fixed maturities [Member] |  |  |  |
Realized Gain/(Losses) [Line Items] |  |  |  |
Net gains (losses) | 0 | 3 | 7 | 1
Other derivatives, net |  |  |  |
Realized Gain/(Losses) [Line Items] |  |  |  |
Net gains (losses) | (1) | 1 | (1) | 1
Standalone derivatives |  |  |  |
Realized Gain/(Losses) [Line Items] |  |  |  |
Net gains (losses) | 0 | (1) | 11 | 0
Managed Custody Guarantees |  |  |  |
Realized Gain/(Losses) [Line Items] |  |  |  |
Net gains (losses) | 2 | 6 | 3 | 6
Stabilizer |  |  |  |
Realized Gain/(Losses) [Line Items] |  |  |  |
Net gains (losses) | 5 | (6) | 10 | (7)
Derivatives |  |  |  |
Realized Gain/(Losses) [Line Items] |  |  |  |
Net gains (losses) | 15 | (128) | (64) | 48
Mortgage loans on real estate |  |  |  |
Realized Gain/(Losses) [Line Items] |  |  |  |
Net gains (losses) | (2) | (4) | (6) | (1)
Other investments |  |  |  |
Realized Gain/(Losses) [Line Items] |  |  |  |
Net gains (losses) | 0 | (3) | (14) | 0
Fixed maturities, available-for-sale, including securities pledged |  |  |  |
Realized Gain/(Losses) [Line Items] |  |  |  |
Net gains (losses) | 13 | 15 | (11) | (19)
Fixed maturities, at fair value option |  |  |  |
Realized Gain/(Losses) [Line Items] |  |  |  |
Net gains (losses) | (50) | 96 | (30) | (15)
Equity securities, at fair value |  |  |  |
Realized Gain/(Losses) [Line Items] |  |  |  |
Net gains (losses) | $ (3) | $ 7 | $ (1) | $ 11

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- Definition Amount of realized gain (loss) on investment. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 + Details
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