Lending Activities - Credit quality of commercial mortgages (Details) $ in Millions	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 14, 2022 USD ($)
Commercial mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	$ 2,850	$ 6,473
Prior year	7,408	3,355
Two years prior	3,923	2,206
Three years prior	1,756	5,453
Four years prior	5,146	5,431
Five years & beyond prior	16,926	14,210
Total	$ 38,009	$ 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%
Commercial mortgage loans | >90 days delinquent or in process of foreclosure(a)
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 43	$ 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		156
AIG Financial Products
Financing Receivable, Credit Quality Indicator [Line Items]
Total	37,600	37,600	$ 37,600
Less than 65% | Commercial mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	2,446	5,425
Prior year	4,629	2,548
Two years prior	2,741	1,775
Three years prior	1,303	3,958
Four years prior	2,832	3,016
Five years & beyond prior	11,571	10,739
Total	25,522	27,461
65% to 75% | Commercial mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	290	998
Prior year	1,763	517
Two years prior	794	405
Three years prior	288	1,445
Four years prior	1,937	1,487
Five years & beyond prior	3,220	1,393
Total	8,292	6,245
76% to 80% | Commercial mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	50
Prior year	375	52
Two years prior	99	0
Three years prior	0	0
Four years prior	377	168
Five years & beyond prior	340	229
Total	1,191	499
Greater than 80% | Commercial mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	114	0
Prior year	641	238
Two years prior	289	26
Three years prior	165	50
Four years prior	0	760
Five years & beyond prior	1,795	1,849
Total	3,004	2,923
Greater than 1.2X | Commercial mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	2,555	5,518
Prior year	6,209	2,457
Two years prior	2,349	1,710
Three years prior	1,387	4,985
Four years prior	4,969	4,120
Five years & beyond prior	13,459	11,663
Total	30,928	30,453
1.00 - 1.20X | Commercial mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	295	910
Prior year	1,149	898
Two years prior	1,574	473
Three years prior	369	416
Four years prior	177	567
Five years & beyond prior	2,632	1,353
Total	6,196	4,617
Less than 1.00X | Commercial mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	45
Prior year	50	0
Two years prior	0	23
Three years prior	0	52
Four years prior	0	744
Five years & beyond prior	835	1,194
Total	$ 885	$ 2,058