Lending Activities - Credit quality of commercial mortgages (Details) $ in Millions	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 52,411	$ 50,321
Commercial mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	1,484	6,473
Prior year	6,746	3,355
Two years prior	3,683	2,206
Three years prior	2,198	5,453
Four years prior	5,420	5,431
Five years & beyond prior	18,395	14,210
Total	$ 37,926	$ 37,128
Weighted average debt service coverage ratio	1.9	1.9
Weighted average loan-to-value ratio (as a percent)	58.00%	59.00%
Commercial mortgage loans | >90 days delinquent or in process of foreclosure(a)
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 199	$ 215
Commercial mortgage loans | Fortitude RE Funds Withheld Assets | >90 days delinquent or in process of foreclosure(a)
Financing Receivable, Credit Quality Indicator [Line Items]
Total	157	156
AIG Financial Products
Financing Receivable, Credit Quality Indicator [Line Items]
Total	37,600	37,600
Less than 65% | Commercial mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	1,048	5,425
Prior year	5,172	2,548
Two years prior	2,744	1,775
Three years prior	1,956	3,958
Four years prior	3,948	3,016
Five years & beyond prior	13,155	10,739
Total	28,023	27,461
65% to 75% | Commercial mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	348	998
Prior year	1,210	517
Two years prior	650	405
Three years prior	76	1,445
Four years prior	1,422	1,487
Five years & beyond prior	2,852	1,393
Total	6,558	6,245
76% to 80% | Commercial mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	50
Prior year	364	52
Two years prior	52	0
Three years prior	0	0
Four years prior	0	168
Five years & beyond prior	469	229
Total	885	499
Greater than 80% | Commercial mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	88	0
Prior year	0	238
Two years prior	237	26
Three years prior	166	50
Four years prior	50	760
Five years & beyond prior	1,919	1,849
Total	2,460	2,923
Greater than 1.2X | Commercial mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	1,363	5,518
Prior year	5,558	2,457
Two years prior	2,531	1,710
Three years prior	1,263	4,985
Four years prior	5,190	4,120
Five years & beyond prior	14,809	11,663
Total	30,714	30,453
1.00 - 1.20X | Commercial mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	54	910
Prior year	1,138	898
Two years prior	1,152	473
Three years prior	912	416
Four years prior	230	567
Five years & beyond prior	1,771	1,353
Total	5,257	4,617
Less than 1.00X | Commercial mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	67	45
Prior year	50	0
Two years prior	0	23
Three years prior	23	52
Four years prior	0	744
Five years & beyond prior	1,815	1,194
Total	$ 1,955	$ 2,058