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FINANCIAL COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Other Commitments [Line Items]    
FHLB, maximum amount available $ 1,400 $ 881
Municipal Bonds and Collateralized Mortgage Obligations    
Other Commitments [Line Items]    
FHLB, collateral pledged 800 800
Commercial Loan    
Other Commitments [Line Items]    
FHLB, collateral pledged 956 727
Subsidiary borrowings    
Other Commitments [Line Items]    
Outstanding letters of credit 40 437
Subsidiary borrowings | Commitments to purchase, expand or improve real estate and to fund mortgage loans, private loans and investment funds    
Other Commitments [Line Items]    
Aggregate commitments $ 9,700 10,300
Subsidiary borrowings | Future payments, inclusive of office space construction costs    
Other Commitments [Line Items]    
Aggregate commitments   $ 147