Debt - Schedule of Outstanding Debt (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Long-term debt	$ 9,191	$ 8,922
Consolidated Entities, Excluding Consolidated Investments
Debt Instrument [Line Items]
Long-term debt	9,035	8,764
Consolidated Investments, Including Variable Interest Entities, Primarily Beneficiary
Debt Instrument [Line Items]
Long-term debt	156	158
Unsecured Debt
Debt Instrument [Line Items]
Long-term debt	9,010	8,726
Unsecured Debt | Notes and bonds payable
Debt Instrument [Line Items]
Long-term debt	8,529	7,885
Unsecured Debt | Junior subordinated debt
Debt Instrument [Line Items]
Long-term debt	481	602
Unsecured Debt | AIG Japan Holdings Kabushiki Kaisha
Debt Instrument [Line Items]
Long-term debt	0	239
Secured Debt | Notes and bonds payable
Debt Instrument [Line Items]
Long-term debt	25	37
Debt Not Guaranteed | Other subsidiaries notes, bonds, loans and mortgages payable
Debt Instrument [Line Items]
Long-term debt	0	1
Debt Not Guaranteed | Debt of consolidated investment entities | Real Estate and Investment Entities
Debt Instrument [Line Items]
Long-term debt	$ 156	$ 158
Minimum | Unsecured Debt | Notes and bonds payable
Debt Instrument [Line Items]
Interest rate (as a percent)	1.58%
Minimum | Unsecured Debt | Junior subordinated debt
Debt Instrument [Line Items]
Interest rate (as a percent)	5.75%
Minimum | Secured Debt | Notes and bonds payable
Debt Instrument [Line Items]
Interest rate (as a percent)	3.77%
Minimum | Debt Not Guaranteed | Debt of consolidated investment entities
Debt Instrument [Line Items]
Interest rate (as a percent)	4.15%
Maximum | Unsecured Debt | Notes and bonds payable
Debt Instrument [Line Items]
Interest rate (as a percent)	6.82%
Maximum | Unsecured Debt | Junior subordinated debt
Debt Instrument [Line Items]
Interest rate (as a percent)	8.18%
Maximum | Secured Debt | Notes and bonds payable
Debt Instrument [Line Items]
Interest rate (as a percent)	7.00%
Maximum | Debt Not Guaranteed | Debt of consolidated investment entities
Debt Instrument [Line Items]
Interest rate (as a percent)	4.48%