INVESTMENTS - Loan Performance After Modifications (Details) $ in Millions	Mar. 31, 2025 USD ($)
Financing Receivable, Modified, Past Due [Line Items]
Loan modification, after 12 months, nonaccrual	$ 20
Current
Financing Receivable, Modified, Past Due [Line Items]
Loan modification, after 12 months	443
Less Than 90 Days Past Due
Financing Receivable, Modified, Past Due [Line Items]
Loan modification, after 12 months	0
90 Days or More Past Due
Financing Receivable, Modified, Past Due [Line Items]
Loan modification, after 12 months	0
Transitional real estate loans
Financing Receivable, Modified, Past Due [Line Items]
Loan modification, after 12 months, nonaccrual	0
Transitional real estate loans | Current
Financing Receivable, Modified, Past Due [Line Items]
Loan modification, after 12 months	347
Transitional real estate loans | Less Than 90 Days Past Due
Financing Receivable, Modified, Past Due [Line Items]
Loan modification, after 12 months	0
Transitional real estate loans | 90 Days or More Past Due
Financing Receivable, Modified, Past Due [Line Items]
Loan modification, after 12 months	0
Middle market loans
Financing Receivable, Modified, Past Due [Line Items]
Loan modification, after 12 months, nonaccrual	20
Middle market loans | Current
Financing Receivable, Modified, Past Due [Line Items]
Loan modification, after 12 months	96
Middle market loans | Less Than 90 Days Past Due
Financing Receivable, Modified, Past Due [Line Items]
Loan modification, after 12 months	0
Middle market loans | 90 Days or More Past Due
Financing Receivable, Modified, Past Due [Line Items]
Loan modification, after 12 months	$ 0