Lending Activities - Rollforward of the Changes in the Allowance for Credit Losses on Mortgage and Other Loans Receivable (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Changes in the allowance for losses on Mortgage and other loans receivable
Allowance, beginning of year			$ 37,800
Allowance, end of period	$ 37,740		37,740
Commercial mortgage loans
Changes in the allowance for losses on Mortgage and other loans receivable
Allowance, beginning of year	106	$ 162	163	$ 138
Loans charged off	(8)	0	(60)	0
Net charge-offs	(8)	0	(60)	0
Addition to (release of) allowance for loan losses	6	3	1	27
Allowance, end of period	104	165	104	165
Off-balance-sheet commitments	0	5	0	5	$ 8
Total	2,869		2,869		3,305
Other Loans
Changes in the allowance for losses on Mortgage and other loans receivable
Allowance, beginning of year	0	1	1	2
Loans charged off	0	0	0	0
Net charge-offs	0	0	0	0
Addition to (release of) allowance for loan losses	0	1	(1)	0
Allowance, end of period	0	2	0	2
Excluding AIGFP Operating
Changes in the allowance for losses on Mortgage and other loans receivable
Allowance, beginning of year	106	163	164	140
Loans charged off	(8)	0	(60)	0
Net charge-offs	(8)	0	(60)	0
Addition to (release of) allowance for loan losses	6	4	0	27
Allowance, end of period	104	167	104	167
Total	3,418		3,418		4,032
AIG Financial Products
Changes in the allowance for losses on Mortgage and other loans receivable
Allowance, beginning of year			37,600
Allowance, end of period	37,600	37,600	37,600	37,600
Total	$ 37,600	$ 37,600	$ 37,600	$ 37,600	$ 37,600