INVESTMENTS - Nonaccrual Loans (Details) - USD ($) $ in Millions	Jun. 30, 2024		Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Total	$ 12,033		$ 12,801
Total, nonaccrual status	539		718
Total, 90 days or more past due and still accruing	106		0
Transitional real estate loans
Financing Receivable, Past Due [Line Items]
Total	5,669		6,114
Total, nonaccrual status	475		633
Commercial mortgage loans
Financing Receivable, Past Due [Line Items]
Total	1,608		1,709
Total, nonaccrual status	21		0
Middle market loans
Financing Receivable, Past Due [Line Items]
Total	4,489		4,677
Total, nonaccrual status	43		85
Other loans
Financing Receivable, Past Due [Line Items]
Total	267		301
Total, nonaccrual status	0		0
Current
Financing Receivable, Past Due [Line Items]
Total	11,152		12,050
Current | Transitional real estate loans
Financing Receivable, Past Due [Line Items]
Total	4,934		5,481
Current | Commercial mortgage loans
Financing Receivable, Past Due [Line Items]
Total	1,587		1,676
Current | Middle market loans
Financing Receivable, Past Due [Line Items]
Total	4,384		4,592
Current | Other loans
Financing Receivable, Past Due [Line Items]
Total	247		301
Less Than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	279		141
Less Than 90 Days Past Due | Transitional real estate loans
Financing Receivable, Past Due [Line Items]
Total	217		108
Less Than 90 Days Past Due | Commercial mortgage loans
Financing Receivable, Past Due [Line Items]
Total	0		33
Less Than 90 Days Past Due | Middle market loans
Financing Receivable, Past Due [Line Items]
Total	62		0
Less Than 90 Days Past Due | Other loans
Financing Receivable, Past Due [Line Items]
Total	0		0
90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total	602	[1]	610	[2]
90 Days or More Past Due | Transitional real estate loans
Financing Receivable, Past Due [Line Items]
Total	518	[1]	525	[2]
90 Days or More Past Due | Commercial mortgage loans
Financing Receivable, Past Due [Line Items]
Total	21	[1]	0	[2]
90 Days or More Past Due | Middle market loans
Financing Receivable, Past Due [Line Items]
Total	43	[1]	85	[2]
90 Days or More Past Due | Other loans
Financing Receivable, Past Due [Line Items]
Total	20	[1]	0	[2]
Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total	881		751
Financial Asset, Past Due | Transitional real estate loans
Financing Receivable, Past Due [Line Items]
Total	735		633
Financial Asset, Past Due | Commercial mortgage loans
Financing Receivable, Past Due [Line Items]
Total	21		33
Financial Asset, Past Due | Middle market loans
Financing Receivable, Past Due [Line Items]
Total	105		85
Financial Asset, Past Due | Other loans
Financing Receivable, Past Due [Line Items]
Total	$ 20		$ 0

[1] As of June 30, 2024, there were $106 of loans that were 90 days or more past due that continued to accrue interest.

[2] As of December 31, 2023, there were no loans that were 90 days or more past due that continued to accrue interest.