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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)