INVESTMENTS - Nonaccrual Loans (Details) - USD ($) $ in Millions		Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Total		$ 13,133	$ 13,688
Total, nonaccrual status		620
Total, 90 days or more past due and still accruing		0
Transitional real estate loans
Financing Receivable, Past Due [Line Items]
Total		6,550
Total, nonaccrual status		545
Commercial mortgage loans
Financing Receivable, Past Due [Line Items]
Total		1,734
Total, nonaccrual status		0
Middle market loans
Financing Receivable, Past Due [Line Items]
Total		4,849
Total, nonaccrual status		75
Current
Financing Receivable, Past Due [Line Items]
Total		12,513
Current | Transitional real estate loans
Financing Receivable, Past Due [Line Items]
Total		6,005
Current | Commercial mortgage loans
Financing Receivable, Past Due [Line Items]
Total		1,734
Current | Middle market loans
Financing Receivable, Past Due [Line Items]
Total		4,774
Less Than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total		54
Less Than 90 Days Past Due | Transitional real estate loans
Financing Receivable, Past Due [Line Items]
Total		54
Less Than 90 Days Past Due | Commercial mortgage loans
Financing Receivable, Past Due [Line Items]
Total		0
Less Than 90 Days Past Due | Middle market loans
Financing Receivable, Past Due [Line Items]
Total		0
90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total	[1]	566
90 Days or More Past Due | Transitional real estate loans
Financing Receivable, Past Due [Line Items]
Total	[1]	491
90 Days or More Past Due | Commercial mortgage loans
Financing Receivable, Past Due [Line Items]
Total	[1]	0
90 Days or More Past Due | Middle market loans
Financing Receivable, Past Due [Line Items]
Total	[1]	75
Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total		620
Financial Asset, Past Due | Transitional real estate loans
Financing Receivable, Past Due [Line Items]
Total		545
Financial Asset, Past Due | Commercial mortgage loans
Financing Receivable, Past Due [Line Items]
Total		0
Financial Asset, Past Due | Middle market loans
Financing Receivable, Past Due [Line Items]
Total		$ 75

[1] As of September 30, 2023, there were no loans that were 90 days or more past due that continued to accrue interest