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SALE OF COMMERCIAL RETAIL BUSINESS AND RENEWAL RIGHTS - Narrative (Details) $ in Millions, $ in Millions			3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 10, 2025 USD ($)	Oct. 26, 2025 USD ($)	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Dec. 31, 2025 USD ($)	Mar. 22, 2026 CAD ($)
Effects of Reinsurance [Line Items]
Total net realized gains (losses) from dispositions			$ (2)	$ (8)	$ (18)	$ (13)
Other liabilities			753		753		$ 797
American International Group, Inc.
Effects of Reinsurance [Line Items]
Aggregate renewed premiums		15.00%
Additional monthly consideration		$ 10
Additional monthly consideration, term		9 months
Severance costs			$ 25		$ 106		28
Legal expenses and merger and acquisition fees							21
American International Group, Inc. \| Software, In-Development, Internally Developed, and Purchased
Effects of Reinsurance [Line Items]
Impairments of capitalized software							83
American International Group, Inc. \| United States, United Kingdom, And Asia Pacific
Effects of Reinsurance [Line Items]
Aggregate purchase price		$ 252
Aggregate renewed premiums		80.00%
Aggregate purchase price, not to exceed		$ 70
Total net realized gains (losses) from dispositions							204
Other liabilities							47
Other nonrecurring income							$ 30
American International Group, Inc. \| European Union
Effects of Reinsurance [Line Items]
Aggregate purchase price		$ 49
Total net realized gains (losses) from dispositions	$ 55
Disposal Group, Held-for-Sale, Not Discontinued Operations \| Everest Canada
Effects of Reinsurance [Line Items]
Disposal retail Insurance operations								$ 410