Basis of Presentation (Details) $ / shares in Units, € in Millions, £ in Millions, $ in Millions										6 Months Ended	12 Months Ended
	Nov. 01, 2023 USD ($) shares	Oct. 31, 2023 USD ($)	Oct. 31, 2023 EUR (€)	Jul. 03, 2023 USD ($)	Dec. 14, 2022 USD ($)	Sep. 19, 2022 USD ($) $ / shares shares	Dec. 15, 2021 USD ($)	Nov. 02, 2021	Jul. 16, 2021 USD ($) mutualFund	Jun. 30, 2024 GBP (£)	Dec. 31, 2023 USD ($) stockOffering country shares	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 04, 2023 USD ($)
Basis of Presentation Information
Number of countries in which the entity operates | country											190
Net income											$ 3,878.0	$ 11,273.0	$ 10,906.0
Contributions from noncontrolling interests											49.0	133.0	22.0
Net gain (loss) on divestitures and other											$ 643.0	(82.0)	3,044.0
Number of retail mutual funds | mutualFund									12
Sale Of Stock, Number Of Secondary Offerings | stockOffering											3
Parent Company
Basis of Presentation Information
Net income											$ 3,643.0	10,209.0	10,367.0
Net gain (loss) on divestitures and other											$ (5.0)	(111.0)	10.0
Pre-tax loss on deconsolidation					$ 114.0
SAAMCo
Basis of Presentation Information
Assets under management									$ 6,800.0
Annual increase period (in years)									3 years
IPO | Corebridge Financial Inc
Basis of Presentation Information
Shares issued in IPO (in shares) | shares						80,000,000
Gross proceeds from sale of stock						$ 1,700.0
Price per share (in USD per share) | $ / shares						$ 21.00
Percentage of stock sold (as a percent)						12.40%
Secondary Offering, Corebridge Common Stock | Corebridge Financial Inc
Basis of Presentation Information
Shares issued in IPO (in shares) | shares											159,750,000
Gross proceeds from sale of stock											$ 2,900.0
Corebridge Common Stock | Corebridge Financial Inc | AIG
Basis of Presentation Information
Total number of warrants repurchased (in shares) | shares											17,200,000
Corebridge Common Stock | CoreBridge
Basis of Presentation Information
Total number of warrants repurchased (in shares) | shares											26,500,000
Aggregate purchase price of repurchased shares											$ 498.0
Corebridge Common Stock | CoreBridge | AIG
Basis of Presentation Information
Aggregate purchase price of repurchased shares											$ 315.0
Corebridge Financial Inc
Basis of Presentation Information
Ownership (as a percent)											52.20%
Corebridge Financial Inc | Blackstone
Basis of Presentation Information
Ownership percentage by noncontrolling owners								9.90%
Percent of ownership interest permitted to be sold after first anniversary								25.00%
Percent of ownership interest permitted to be sold after second anniversary								67.00%
Percent of ownership interest permitted to be sold after third anniversary								75.00%
Aigs Interest In Us Affordable Housing Portfolio
Basis of Presentation Information
Disposal consideration							$ 4,900.0
Net gain (loss) on divestitures and other							$ 3,000.0
Sale of Assets | Other
Basis of Presentation Information
Cash consideration for divestiture of business		$ 731.0	€ 691
Pre-tax gain on disposal of business		$ 652.0
Sale of Assets | Validus Re
Basis of Presentation Information
Cash consideration for divestiture of business	$ 2,700.0
Contingent consideration	$ 130.0
Reimbursement to be received												400.0
Reserve balance												3,043.0
Expected premium to be paid														$ 80.0
Share consideration received on transaction (in shares) | shares	1,300,000
Value of share consideration received on transaction	$ 290.0
Pre-tax gain on disposal of business	$ (78.0)
Sale of Assets | Crop Risk Services
Basis of Presentation Information
Cash consideration for divestiture of business				$ 234.0
Pre-tax gain on disposal of business				$ 72.0
Forecast | Assets held-for-sale | AIG Life
Basis of Presentation Information
Cash consideration for divestiture of business | £										£ 460
Total AIG Shareholders' Equity
Basis of Presentation Information
Net income											$ 3,643.0	10,227.0	10,367.0
Contributions from noncontrolling interests						$ 497.0					145.0	497.0	$ (630.0)
Total AIG Shareholders' Equity | Secondary Offering, Corebridge Common Stock
Basis of Presentation Information
Contributions from noncontrolling interests											332.0
Total AIG Shareholders' Equity | Corebridge Common Stock | CoreBridge
Basis of Presentation Information
Decrease in shareholders' equity											$ 40.0
Cumulative effect of change in accounting principle | Total AIG Shareholders' Equity
Basis of Presentation Information
Net income												$ 100.0