Annual report pursuant to Section 13 and 15(d)

DEBT - SBIC Debentures Schedule of Maturities Dates and Fixed Interest Rates (Details)

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DEBT - SBIC Debentures Schedule of Maturities Dates and Fixed Interest Rates (Details) - USD ($)
Dec. 31, 2023
Dec. 31, 2022
Debt Instrument [Line Items]    
Debentures $ 1,810,000,000 $ 2,007,000,000
Unsecured Notes | 3.16% Fixed Interest Rate    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated (as a percent) 3.16%  
Debentures $ 0 16,000,000
Unsecured Notes | 3.95% Fixed Interest Rate    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated (as a percent) 3.95%  
Debentures $ 39,000,000 39,000,000
Unsecured Notes | 3.55% Fixed Interest Rate    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated (as a percent) 3.55%  
Debentures $ 24,800,000 24,800,000
Unsecured Notes | 3.52% Fixed Interest Rate    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated (as a percent) 3.52%  
Debentures $ 40,400,000 40,400,000
Unsecured Notes | 3.19% Fixed Interest Rate    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated (as a percent) 3.19%  
Debentures $ 34,600,000 34,600,000
Unsecured Notes | 3.41% Fixed Interest Rate    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated (as a percent) 3.41%  
Debentures $ 43,000,000 43,000,000
Unsecured Notes | 3.55% Fixed Interest Rate    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated (as a percent) 3.55%  
Debentures $ 32,000,000 32,000,000
Unsecured Notes | 2.35% Fixed Interest Rate    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated (as a percent) 2.35%  
Debentures $ 15,000,000 15,000,000
Unsecured Notes | 1.13% Fixed Interest Rate    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated (as a percent) 1.13%  
Debentures $ 10,000,000 10,000,000
Unsecured Notes | 1.31% Fixed Interest Rate    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated (as a percent) 1.31%  
Debentures $ 10,000,000 10,000,000
Unsecured Notes | 1.94% Fixed Interest Rate    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated (as a percent) 1.94%  
Debentures $ 25,200,000 25,200,000
Unsecured Notes | 1.58% Fixed Interest Rate    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated (as a percent) 1.58%  
Debentures $ 60,000,000 60,000,000
Unsecured Notes | 5.74% Fixed Interest Rate    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated (as a percent) 5.74%  
Debentures $ 16,000,000 0
Unsecured Notes | SBIC Debentures    
Debt Instrument [Line Items]    
Debentures $ 350,000,000 $ 350,000,000