v3.26.3
SALE OF COMMERCIAL RETAIL BUSINESS AND RENEWAL RIGHTS - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 10, 2025
Oct. 26, 2025
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Effects of Reinsurance [Line Items]              
Gain on sale in disposition of assets     $ (10) $ (36) $ (28) $ (49)  
Other liabilities     943   943   $ 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     $ (15)   $ (116)   28
Impairments of capitalized software             83
Legal expenses and merger and acquisition fees             21
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          
Gain on sale in disposition of assets             204
Other liabilities             47
Other nonrecurring income             $ 30
American International Group, Inc. | European Union              
Effects of Reinsurance [Line Items]              
Aggregate purchase price   $ 49          
Gain on sale in disposition of assets $ 55