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FINANCING ACTIVITIES AND OFF-BALANCE SHEET RISK - NARRATIVE (Details) - USD ($)
1 Months Ended 3 Months Ended
Apr. 30, 2022
Apr. 30, 2021
Oct. 31, 2019
Mar. 31, 2022
Dec. 31, 2021
Oct. 31, 2020
Debt Instrument [Line Items]            
Settlement date basis, equities       2 days    
Settlement date basis, options       1 day    
Revolving Credit Facility | October 2019 Credit Facility | Line of Credit            
Debt Instrument [Line Items]            
Line of credit facility, amount entered into     $ 200,000,000      
Outstanding borrowings, long-term       $ 0 $ 0  
Commitment fee percentage     0.10%      
Revolving Credit Facility | October 2019 Credit Facility | Eurodollar | Line of Credit            
Debt Instrument [Line Items]            
Variable rate on loan     1.00%      
Revolving Credit Facility | October 2019 Credit Facility | Federal Reserve Bank of New York Rate | Line of Credit            
Debt Instrument [Line Items]            
Variable rate on loan     0.50%      
Revolving Credit Facility | October 2019 Credit Facility | Eurodollar, One Month Interest Period | Line of Credit            
Debt Instrument [Line Items]            
Variable rate on loan     1.00%      
Revolving Credit Facility | October 2019 Credit Facility, As Amended | Line of Credit            
Debt Instrument [Line Items]            
Line of credit facility, amount entered into   $ 625,000,000       $ 600,000,000
Revolving Credit Facility | Line of Credit | April 2021 Credit Facility            
Debt Instrument [Line Items]            
Line of credit facility, amount entered into   $ 2,180,000,000        
Commitment fee percentage   0.50%        
Outstanding borrowings, short-term       $ 0 $ 0  
Revolving Credit Facility | Line of Credit | April 2021 Credit Facility, Tranche A | Short-Term Funding Rate            
Debt Instrument [Line Items]            
Variable rate on loan   1.25%        
Revolving Credit Facility | Line of Credit | April 2021 Credit Facility, Tranche B and C | Short-Term Funding Rate            
Debt Instrument [Line Items]            
Variable rate on loan   2.50%        
Revolving Credit Facility | Line of Credit | April 2022 Credit Facility | Subsequent Event            
Debt Instrument [Line Items]            
Line of credit facility, amount entered into $ 2,280,000,000          
Agreement fee 3,650,000,000          
Increase limit on credit facility $ 1,140,000,000          
Revolving Credit Facility | Line of Credit | April 2022 Credit Facility, Tranche B and C | SOFR | Subsequent Event            
Debt Instrument [Line Items]            
Variable rate on loan 0.10%