INVESTMENTS - Loan Performance After Modifications (Details) - USD ($) $ in Millions	Jun. 30, 2026	Jun. 30, 2025
Financing Receivable, Modified, Past Due [Line Items]
Loan modification, after 12 months, nonaccrual	$ 135	$ 60
Current
Financing Receivable, Modified, Past Due [Line Items]
Loan modification, after 12 months	219	698
Less Than 90 Days Past Due
Financing Receivable, Modified, Past Due [Line Items]
Loan modification, after 12 months	56	1
90 Days or More Past Due
Financing Receivable, Modified, Past Due [Line Items]
Loan modification, after 12 months	89	60
Transitional real estate loans
Financing Receivable, Modified, Past Due [Line Items]
Loan modification, after 12 months, nonaccrual	135	60
Transitional real estate loans \| Current
Financing Receivable, Modified, Past Due [Line Items]
Loan modification, after 12 months	149	592
Transitional real estate loans \| Less Than 90 Days Past Due
Financing Receivable, Modified, Past Due [Line Items]
Loan modification, after 12 months	46	0
Transitional real estate loans \| 90 Days or More Past Due
Financing Receivable, Modified, Past Due [Line Items]
Loan modification, after 12 months	89	60
Middle market loans
Financing Receivable, Modified, Past Due [Line Items]
Loan modification, after 12 months, nonaccrual	0	0
Middle market loans \| Current
Financing Receivable, Modified, Past Due [Line Items]
Loan modification, after 12 months	70	106
Middle market loans \| Less Than 90 Days Past Due
Financing Receivable, Modified, Past Due [Line Items]
Loan modification, after 12 months	10	1
Middle market loans \| 90 Days or More Past Due
Financing Receivable, Modified, Past Due [Line Items]
Loan modification, after 12 months	$ 0	$ 0