INVESTMENTS - Nonaccrual Loans (Details) - USD ($) $ in Millions	Mar. 31, 2025		Dec. 31, 2024
Financing Receivable, Past Due [Line Items]
Total	$ 11,024		$ 11,224
Total, nonaccrual status	595		486
Total, 90 days or more past due and still accruing	0		0
Transitional real estate loans
Financing Receivable, Past Due [Line Items]
Total	4,678		4,902
Total, nonaccrual status	467		378
Commercial mortgage loans
Financing Receivable, Past Due [Line Items]
Total	1,526		1,537
Total, nonaccrual status	0		0
Middle market loans
Financing Receivable, Past Due [Line Items]
Total	4,451		4,423
Total, nonaccrual status	128		108
Other loans
Financing Receivable, Past Due [Line Items]
Total	369		362
Total, nonaccrual status	0		0
Current
Financing Receivable, Past Due [Line Items]
Total	10,389		10,558
Current | Transitional real estate loans
Financing Receivable, Past Due [Line Items]
Total	4,193		4,364
Current | Commercial mortgage loans
Financing Receivable, Past Due [Line Items]
Total	1,526		1,537
Current | Middle market loans
Financing Receivable, Past Due [Line Items]
Total	4,301		4,295
Current | Other loans
Financing Receivable, Past Due [Line Items]
Total	369		362
Less Than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	88		258
Less Than 90 Days Past Due | Transitional real estate loans
Financing Receivable, Past Due [Line Items]
Total	18		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	70		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	547	[1]	408	[2]
90 Days or More Past Due | Transitional real estate loans
Financing Receivable, Past Due [Line Items]
Total	467	[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	80	[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	635		666
Total Past Due | Transitional real estate loans
Financing Receivable, Past Due [Line Items]
Total	485		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	150		128
Total Past Due | Other loans
Financing Receivable, Past Due [Line Items]
Total	$ 0		$ 0

[1] As of March 31, 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.