INVESTMENTS - Nonaccrual Loans (Details) - USD ($) $ in Millions	Sep. 30, 2025		Dec. 31, 2024
Financing Receivable, Past Due [Line Items]
Total	$ 10,559		$ 11,224
Total, nonaccrual status	467		486
Total, 90 days or more past due and still accruing	0		0
Transitional real estate loans
Financing Receivable, Past Due [Line Items]
Total	4,317		4,902
Total, nonaccrual status	385		378
Commercial mortgage loans
Financing Receivable, Past Due [Line Items]
Total	1,442		1,537
Total, nonaccrual status	0		0
Middle market loans
Financing Receivable, Past Due [Line Items]
Total	4,387		4,423
Total, nonaccrual status	82		108
Other loans
Financing Receivable, Past Due [Line Items]
Total	413		362
Total, nonaccrual status	0		0
Current
Financing Receivable, Past Due [Line Items]
Total	10,015		10,558
Current | Transitional real estate loans
Financing Receivable, Past Due [Line Items]
Total	3,883		4,364
Current | Commercial mortgage loans
Financing Receivable, Past Due [Line Items]
Total	1,442		1,537
Current | Middle market loans
Financing Receivable, Past Due [Line Items]
Total	4,277		4,295
Current | Other loans
Financing Receivable, Past Due [Line Items]
Total	413		362
Less Than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	97		258
Less Than 90 Days Past Due | Transitional real estate loans
Financing Receivable, Past Due [Line Items]
Total	49		195
Less Than 90 Days Past Due | Commercial mortgage loans
Financing Receivable, Past Due [Line Items]
Total	0		0
Less Than 90 Days Past Due | Middle market loans
Financing Receivable, Past Due [Line Items]
Total	48		63
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	447	[1]	408	[2]
90 Days or More Past Due | Transitional real estate loans
Financing Receivable, Past Due [Line Items]
Total	385	[1]	343	[2]
90 Days or More Past Due | Commercial mortgage loans
Financing Receivable, Past Due [Line Items]
Total	0	[1]	0	[2]
90 Days or More Past Due | Middle market loans
Financing Receivable, Past Due [Line Items]
Total	62	[1]	65	[2]
90 Days or More Past Due | Other loans
Financing Receivable, Past Due [Line Items]
Total	0	[1]	0	[2]
Total Past Due
Financing Receivable, Past Due [Line Items]
Total	544		666
Total Past Due | Transitional real estate loans
Financing Receivable, Past Due [Line Items]
Total	434		538
Total Past Due | Commercial mortgage loans
Financing Receivable, Past Due [Line Items]
Total	0		0
Total Past Due | Middle market loans
Financing Receivable, Past Due [Line Items]
Total	110		128
Total Past Due | Other loans
Financing Receivable, Past Due [Line Items]
Total	$ 0		$ 0

[1] As of September 30, 2025, there were no loans that were 90 days or more past due that continued to accrue interest.

[2] As of December 31, 2024, there were no loans that were 90 days or more past due that continued to accrue interest.