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Lending Activities - Composition of Mortgages and Other Loans Receivable (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Composition of Mortgages and other loans receivable
Allowance for credit losses	$ (37,713)	$ (37,747)
Mortgage and other loans receivable, net	2,813	2,887
Commercial mortgages
Composition of Mortgages and other loans receivable
Total mortgage and other loans receivable	2,409	2,495
Allowance for credit losses	(77)	(111)
Off-balance-sheet commitments	0		$ 8
Loans on nonaccrual status	119	160
Accrued interest receivable	$ 11	$ 11
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	14.00%	13.00%
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	14.00%	14.00%
Commercial loans, other loans and notes receivable
Composition of Mortgages and other loans receivable
Total mortgage and other loans receivable	$ 481	$ 503
Excluding AIGFP Operating
Composition of Mortgages and other loans receivable
Total mortgage and other loans receivable	2,890	2,998
Allowance for credit losses	(77)	(111)	(155)	$ (164)
Mortgage and other loans receivable, net	2,813	2,887
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)