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Investments - Schedule of Changes in Unrealized Appreciation (Depreciation) of Available for Sale Securities and Other Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Equity Securities, FV-NI, Unrealized Gain (Loss) [Abstract] |  |  |  |
Net gains (losses) recognized during the period on equity securities and other investments | $ (182) | $ 102 | $ 586 | $ 378
Less: Net gains (losses) recognized during the period on equity securities and other investments sold during the period | (63) | 8 | (29) | 75
Unrealized gains (losses) recognized during the reporting period on equity securities and other investments still held at the reporting date | (119) | 94 | 615 | 303
Corebridge Financial Inc |  |  |  |
Equity Securities, FV-NI, Unrealized Gain (Loss) [Abstract] |  |  |  |
Unrealized gains (losses) recognized during the reporting period on equity securities and other investments still held at the reporting date | (348) | (35) | 316 | 30
Continuing Operations, Excluding Held-For-Sale |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Increase (decrease) in unrealized appreciation (depreciation) of investments | 543 | 1,597 | 1,370 | 1,441
Fixed maturity securities | Continuing Operations, Excluding Held-For-Sale |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Increase (decrease) in unrealized appreciation (depreciation) of investments | 543 | 1,616 | 1,370 | 1,499
Other investments | Continuing Operations, Excluding Held-For-Sale |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Increase (decrease) in unrealized appreciation (depreciation) of investments | 0 | (19) | 0 | (58)
Equities |  |  |  |
Equity Securities, FV-NI, Unrealized Gain (Loss) [Abstract] |  |  |  |
Net gains (losses) recognized during the period on equity securities and other investments | 62 | 60 | 85 | 144
Less: Net gains (losses) recognized during the period on equity securities and other investments sold during the period | 2 | 8 | 3 | 51
Unrealized gains (losses) recognized during the reporting period on equity securities and other investments still held at the reporting date | 60 | 52 | 82 | 93
Other invested assets |  |  |  |
Equity Securities, FV-NI, Unrealized Gain (Loss) [Abstract] |  |  |  |
Net gains (losses) recognized during the period on equity securities and other investments | (244) | 42 | 501 | 234
Less: Net gains (losses) recognized during the period on equity securities and other investments sold during the period | (65) | 0 | (32) | 24
Unrealized gains (losses) recognized during the reporting period on equity securities and other investments still held at the reporting date | $ (179) | $ 42 | $ 533 | $ 210

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- Definition Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + 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)(d)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-4 + Details
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- Definition Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + 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)(d)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-4 + Details
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- Definition Amount, before tax and adjustment, of unrealized holding gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Excludes unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-9 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-11 + Details
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