INVESTMENTS - Effect of Loan Modifications (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Middle market loans | Term extension
Financing Receivable, Modified [Line Items]
Loan modification, amortized cost	[1]	$ 13		$ 46
Loan modification, percent of total amortized cost		0.30%		1.10%
Loan modification, term extension		17 months		9 months
Middle market loans | Principal forgiveness and term extension
Financing Receivable, Modified [Line Items]
Loan modification, amortized cost	[1]	$ 9		$ 35
Loan modification, percent of total amortized cost		0.20%		0.80%
Loan modification, term extension		43 months		33 months
Loan modification, principal forgiven		$ 6		$ 40
Middle market loans | Principal forgiveness, term extension, and interest rate reduction
Financing Receivable, Modified [Line Items]
Loan modification, amortized cost	[1]	$ 13		$ 13
Loan modification, percent of total amortized cost		0.30%		0.30%
Loan modification, term extension		45 months		45 months
Loan modification, principal forgiven		$ 5		$ 5
Weighted-average interest rate before modification, duration		10.50%		10.50%
Weighted-average interest rate after modification, duration		9.50%		9.50%
Middle market loans | Principal forgiveness
Financing Receivable, Modified [Line Items]
Loan modification, amortized cost	[1]			$ 6
Loan modification, percent of total amortized cost				0.10%
Loan modification, principal forgiven				$ 4
Middle market loans | Other-than-insignificant payment delays
Financing Receivable, Modified [Line Items]
Loan modification, amortized cost	[1]			$ 28
Loan modification, percent of total amortized cost				0.70%
Loan modification, deferral period, duration				36 months
Transitional real estate loans | Term extension
Financing Receivable, Modified [Line Items]
Loan modification, amortized cost	[1]			$ 158
Loan modification, percent of total amortized cost				3.90%
Loan modification, term extension				20 months
Transitional real estate loans | Term extension and interest rate reduction
Financing Receivable, Modified [Line Items]
Loan modification, amortized cost	[1]			$ 155
Loan modification, percent of total amortized cost				3.80%
Loan modification, term extension				26 months
Weighted-average interest rate before modification, duration				4.80%
Weighted-average interest rate after modification, duration				4.30%
Transitional real estate loans | Other-than-insignificant payment delays
Financing Receivable, Modified [Line Items]
Loan modification, amortized cost	[1]		$ 123		$ 198
Loan modification, percent of total amortized cost			2.30%		3.80%
Loan modification, deferral period, duration			24 months		29 months
Transitional real estate loans | Other-than-insignificant payment delays and interest rate reduction
Financing Receivable, Modified [Line Items]
Loan modification, amortized cost	[1]				$ 216
Loan modification, percent of total amortized cost					4.10%
Weighted-average interest rate before modification, duration					7.90%
Weighted-average interest rate after modification, duration					6.60%
Loan modification, deferral period, duration					47 months

[1] Net of allowance for credit losses