Lending Activities - Credit quality of commercial mortgages (Details) $ in Millions	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 51,616	$ 50,321
Commercial mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	396	6,473
Prior year	6,715	3,355
Two years prior	3,491	2,206
Three years prior	2,220	5,453
Four years prior	5,507	5,431
Five years & beyond prior	19,450	14,210
Total	$ 37,779	$ 37,128
Weighted average debt service coverage ratio	1.9	1.9
Weighted average loan-to-value ratio (as a percent)	59.00%	59.00%
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	354	5,425
Prior year	5,602	2,548
Two years prior	2,674	1,775
Three years prior	1,786	3,958
Four years prior	4,006	3,016
Five years & beyond prior	14,091	10,739
Total	28,513	27,461
65% to 75% | Commercial mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	42	998
Prior year	1,063	517
Two years prior	527	405
Three years prior	269	1,445
Four years prior	1,451	1,487
Five years & beyond prior	2,509	1,393
Total	5,861	6,245
76% to 80% | Commercial mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	50
Prior year	50	52
Two years prior	52	0
Three years prior	0	0
Four years prior	0	168
Five years & beyond prior	424	229
Total	526	499
Greater than 80% | Commercial mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Prior year	0	238
Two years prior	238	26
Three years prior	165	50
Four years prior	50	760
Five years & beyond prior	2,426	1,849
Total	2,879	2,923
Greater than 1.2X | Commercial mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	339	5,518
Prior year	5,615	2,457
Two years prior	2,441	1,710
Three years prior	1,288	4,985
Four years prior	5,076	4,120
Five years & beyond prior	15,838	11,663
Total	30,597	30,453
1.00 - 1.20X | Commercial mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	57	910
Prior year	1,051	898
Two years prior	1,050	473
Three years prior	909	416
Four years prior	431	567
Five years & beyond prior	1,686	1,353
Total	5,184	4,617
Less than 1.00X | Commercial mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	45
Prior year	49	0
Two years prior	0	23
Three years prior	23	52
Four years prior	0	744
Five years & beyond prior	1,926	1,194
Total	$ 1,998	$ 2,058