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FINANCING ACTIVITIES AND OFF-BALANCE SHEET RISK - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended
Mar. 24, 2023
Apr. 30, 2022
Mar. 31, 2023
Dec. 31, 2022
Apr. 30, 2021
Oct. 31, 2019
Debt Instrument [Line Items]            
Settlement date basis, equities     2 days      
Settlement date basis, options     1 day      
Revolving Credit Facility | Line of Credit | April 2023 Credit Agreement            
Debt Instrument [Line Items]            
Increase limit on credit facility $ 1,087,500,000.0000          
Agreement fee $ 3,262,500,000          
Unused capacity, commitment fee percentage 0.50%          
Revolving Credit Facility | Line of Credit | April 2023 Credit Agreement | SOFR            
Debt Instrument [Line Items]            
Variable rate on loan 0.10%          
Revolving Credit Facility | Line of Credit | April 2023 Credit Facility, Tranche A            
Debt Instrument [Line Items]            
Variable rate on loan 1.25%          
Revolving Credit Facility | Line of Credit | April 2023 Credit Facility, Tranche B and C            
Debt Instrument [Line Items]            
Variable rate on loan 2.50%          
Revolving Credit Facility | Line of Credit | October 2019 Credit Facility            
Debt Instrument [Line Items]            
Line of credit facility, amount entered into           $ 200,000,000
Outstanding borrowings, long-term     $ 0 $ 0    
Revolving Credit Facility | Line of Credit | October 2019 Credit Facility, As Amended            
Debt Instrument [Line Items]            
Line of credit facility, amount entered into         $ 625,000,000  
Revolving Credit Facility | Line of Credit | April 2023 Credit Agreement            
Debt Instrument [Line Items]            
Line of credit facility, amount entered into $ 2,175,000,000 $ 2,275,000,000        
Line of credit facility, term 364 days 364 days