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INCOME AND EXCISE TAXES - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Investments, Owned, Federal Income Tax Note [Line Items]                    
Capital loss carryforward $ 152.0                  
Capital loss carryforwards subject to limitations 92.0                  
Carry forward of excess distributable earnings 635.0 $ 646.0 $ 679.0              
Excise tax expense 23.0 30.0 24.0              
Refund request for overpayment of excise taxes 2.0   1.0              
Tax cost basis 22,500.0 22,000.0                
Aggregate gross unrealized gain for federal tax purposes 1,300.0 1,000.0                
Aggregate gross unrealized loss for federal tax purposes 1,700.0 1,200.0                
Amortized cost of investments 22,667.6 [1] 22,043.0 [2]                
Tax reclassification of stockholders' equity, increase (decreased) 0.0 0.0 0.0              
Total stockholders’ equity 11,201.0 9,555.0 8,868.0 $ 7,176.0 $ 7,467.0 $ 7,300.0 $ 7,098.0 $ 5,165.0 $ 5,173.0 $ 5,284.0
Income tax expense, including excise tax 20.0 55.0 29.0              
Subsidiaries                    
Investments, Owned, Federal Income Tax Note [Line Items]                    
Income tax expense, including excise tax (3.0) 25.0 6.0              
Capital in Excess of Par Value                    
Investments, Owned, Federal Income Tax Note [Line Items]                    
Tax reclassification of stockholders' equity, increase (decreased) (20.0) (22.0) 40.0              
Total stockholders’ equity 10,738.0 9,556.0 8,553.0 7,656.0            
Accumulated Undistributed (Overdistributed) Earnings                    
Investments, Owned, Federal Income Tax Note [Line Items]                    
Tax reclassification of stockholders' equity, increase (decreased) 20.0 22.0 (40.0)              
Total stockholders’ equity 462.0 (2.0) $ 315.0 $ (480.0)            
Retained Earnings, Accumulated Undistributed Net Investment Income                    
Investments, Owned, Federal Income Tax Note [Line Items]                    
Total stockholders’ equity 659.0 519.0                
Retained Earnings, Accumulated Net Realized Losses                    
Investments, Owned, Federal Income Tax Note [Line Items]                    
Total stockholders’ equity (256.0) (146.0)                
Retained Earnings, Accumulated Net Unrealized Gains                    
Investments, Owned, Federal Income Tax Note [Line Items]                    
Total stockholders’ equity $ 59.0 $ (375.0)                
[1] As of December 31, 2023, the estimated net unrealized loss for federal tax purposes was $0.4 billion based on a tax cost basis of $22.5 billion. As of December 31, 2023, the estimated aggregate gross unrealized loss for federal income tax purposes was $1.7 billion and the estimated aggregate gross unrealized gain for federal income tax purposes was $1.3 billion.     
[2] As of December 31, 2022, the estimated net unrealized loss for federal tax purposes was $0.2 billion based on a tax cost basis of $22.0 billion. As of December 31, 2022, the estimated aggregate gross unrealized loss for federal income tax purposes was $1.2 billion and the estimated aggregate gross unrealized gain for federal income tax purposes was $1.0 billion.