Basis of Presentation (Details) shares in Millions, $ in Millions						12 Months Ended
	Feb. 06, 2026 USD ($)	Oct. 30, 2025 USD ($)	Oct. 27, 2025 USD ($)	Nov. 01, 2023 USD ($) shares	Jul. 03, 2023 USD ($)	Dec. 31, 2025 USD ($) country	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 02, 2024 USD ($)
Summary of Significant Accounting Policies [Line Items]
Number of countries in which the entity operates | country						200
Net income (loss)						$ 3,097	$ (926)	$ 3,878
Disposal consideration									$ 600
Transition services period									30 months
Fronting agreement, percent									1
Everest Group, Ltd. Renewal Rights
Summary of Significant Accounting Policies [Line Items]
Consideration transferred for renewal rights			$ 301
Payments for reimbursable expenses for Everest			$ 30
Purchase price adjustment period			90 days
Purchase price adjustment, percent of actual premiums written (as a percent)			15.00%
Reimbursable purchase price, percent of gross written premiums paid and payable less than aggregate premiums (as a percent)			80.00%
Reimbursable purchase price, maximum amount			$ 70
Transition services expense, per month amount			$ 10
Term of transition services payments			9 months
Convex Group Limited | Subsequent event
Summary of Significant Accounting Policies [Line Items]
Ownership (as a percent)	35.00%
Consideration for equity method ownership	$ 2,100
Onex Corporation | Subsequent event
Summary of Significant Accounting Policies [Line Items]
Ownership (as a percent)	9.90%
Consideration for equity method ownership	$ 646
Investment intent, amount	$ 2,000
Equity method investment period	3 years
Sale of Assets | Validus Re
Summary of Significant Accounting Policies [Line Items]
Cash consideration for divestiture of business				$ 2,700
Gain (loss) on disposal of business								(78)
Share consideration received on transaction (in shares) | shares				1.3
Value of share consideration received on transaction		$ 323		$ 290
Sale of Assets | Crop Risk Services
Summary of Significant Accounting Policies [Line Items]
Cash consideration for divestiture of business					$ 234
Gain (loss) on disposal of business								72
Sale of Assets | Global Personal Travel Insurance
Summary of Significant Accounting Policies [Line Items]
Gain (loss) on disposal of business							511
Parent Company
Summary of Significant Accounting Policies [Line Items]
Net income (loss)						3,096	3,038	2,765
Total AIG Share- holders' Equity
Summary of Significant Accounting Policies [Line Items]
Net income (loss)						$ 3,096	$ (1,404)	$ 3,643