INVESTMENTS - Selected Financial Information for the SLDP (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Fair Value	$ 21,779.8	$ 20,009.5
Other assets	81.0	99.0
Total assets	22,398.0	20,843.0
Total liabilities	12,843.0	11,975.0
Total liabilities and stockholders’ equity	22,398.0	20,843.0
Total investment income	2,096.0	1,820.0	$ 1,511.0
Interest expense	455.0	372.0	317.0
Other expenses	27.0	24.0	25.0
Total expenses	949.0	1,050.0	698.0
Net investment income	1,092.0	741.0	794.0
Net realized losses on investments and other transactions	(444.0)	869.0	(310.0)
NET INCREASE IN STOCKHOLDERS’ EQUITY RESULTING FROM OPERATIONS	600.0	1,567.0	484.0
Amortized Cost	22,043.0	19,810.0
Senior Direct Lending Program
Schedule of Investments [Line Items]
Fair Value	4,958.0	4,127.0
Other assets	150.0	84.0
Total assets	5,108.0	4,211.0
Senior notes	3,538.0	2,939.0
Intermediate funding notes	132.0	101.0
Other liabilities	110.0	51.0
Total liabilities	3,780.0	3,091.0
Subordinated certificates and members’ capital	1,328.0	1,120.0
Total liabilities and stockholders’ equity	5,108.0	4,211.0
Total investment income	365.0	282.0	302.0
Interest expense	155.0	91.0	113.0
Other expenses	20.0	18.0	16.0
Total expenses	175.0	109.0	129.0
Net investment income	190.0	173.0	173.0
Net realized losses on investments and other transactions	(147.0)	70.0	(64.0)
NET INCREASE IN STOCKHOLDERS’ EQUITY RESULTING FROM OPERATIONS	43.0	243.0	$ 109.0
Amortized Cost	$ 5,166.0	$ 4,193.0