DEBT - Debt Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Jun. 21, 2019	Jun. 20, 2019
Debt Instrument [Line Items]
Asset coverage requirement applicable to senior securities	200.00%		150.00%	200.00%
Principal amount of debt outstanding	$ 11,754	$ 11,905
Weighted average stated interest rate	4.90%	4.80%
Weighted Average
Debt Instrument [Line Items]
Term of debt instrument	3 years	3 years