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Lending Activities - Composition of Mortgages and Other Loans Receivable (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
Composition of Mortgages and other loans receivable |  |  |  |  |  |
Allowance for credit losses | $ (37,740) | $ (37,800) |  |  |  |
Mortgage and other loans receivable, net | 3,314 | 3,868 |  |  |  |
Commercial mortgages |  |  |  |  |  |
Composition of Mortgages and other loans receivable |  |  |  |  |  |
Total mortgage and other loans receivable | 2,869 | 3,305 |  |  |  |
Allowance for credit losses | (104) | (163) | $ (106) | $ (165) | $ (162) | $ (138)
Off-balance-sheet commitments | 0 | 8 |  | 5 |  |
Loans on nonaccrual status | 151 | 252 |  |  |  |
Accrued interest receivable | $ 14 | $ 15 |  |  |  |
Commercial mortgages | Geographic Concentration Risk | Interest on mortgage and other loans | New York |  |  |  |  |  |
Composition of Mortgages and other loans receivable |  |  |  |  |  |
Percentage of mortgage loans in geographic area | 13.00% | 12.00% |  |  |  |
Commercial mortgages | Geographic Concentration Risk | Interest on mortgage and other loans | California |  |  |  |  |  |
Composition of Mortgages and other loans receivable |  |  |  |  |  |
Percentage of mortgage loans in geographic area | 13.00% | 14.00% |  |  |  |
Life insurance policy loans |  |  |  |  |  |
Composition of Mortgages and other loans receivable |  |  |  |  |  |
Total mortgage and other loans receivable | $ 5 | $ 6 |  |  |  |
Commercial loans, other loans and notes receivable |  |  |  |  |  |
Composition of Mortgages and other loans receivable |  |  |  |  |  |
Total mortgage and other loans receivable | 544 | 721 |  |  |  |
Excluding AIGFP Operating |  |  |  |  |  |
Composition of Mortgages and other loans receivable |  |  |  |  |  |
Total mortgage and other loans receivable | 3,418 | 4,032 |  |  |  |
Allowance for credit losses | (104) | (164) | $ (106) | (167) | $ (163) | $ (140)
Mortgage and other loans receivable, net | 3,314 | 3,868 |  |  |  |
AIG Financial Products |  |  |  |  |  |
Composition of Mortgages and other loans receivable |  |  |  |  |  |
Total mortgage and other loans receivable | 37,600 | 37,600 |  | 37,600 |  |
Allowance for credit losses | $ (37,600) | $ (37,600) |  | $ (37,600) |  |

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