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Long-Term Debt - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 25, 2022
Feb. 07, 2022
Oct. 18, 2021
Oct. 31, 2021
Aug. 31, 2021
Feb. 28, 2022
May 31, 2021
Nov. 04, 2021
Long-term debt                
Long-term debt           $ 21,521,734,000 $ 20,603,123,000  
Farmer Mac notes payable                
Long-term debt                
Proceeds from notes payable       $ 250,000,000        
Debt | Credit availability concentration risk | Long-term debt                
Long-term debt                
Concentration risk, percentage         75.00% 76.00%    
Farmer Mac                
Long-term debt                
Maximum borrowing capacity           $ 5,500,000,000    
Debt instrument, renewal term           1 year    
Debt instrument, termination written notice, term           425 days    
Farmer Mac | Farmer Mac notes payable                
Long-term debt                
Long-term debt           $ 3,018,000,000    
Available under committed loan facilities           2,482,000,000    
Proceeds from notes payable           620,000,000    
Secured debt                
Long-term debt                
Long-term debt           16,464,226,000 $ 16,443,546,000  
Increase (decrease) in debt instrument           $ 20,000,000    
Secured debt | Debt | Credit availability concentration risk                
Long-term debt                
Concentration risk, percentage           77.00% 80.00%  
Collateral trust bonds                
Long-term debt                
Long-term debt           $ 7,294,149,000 $ 7,191,944,000  
Increase (decrease) in debt instrument           102,000,000    
Collateral trust bonds | 3.05% collateral trust bonds                
Long-term debt                
Extinguishment of debt, amount           $ 400,000,000    
Stated interest rate           3.05%    
Collateral trust bonds | 2.75% collateral trust bonds                
Long-term debt                
Debt instrument, face amount   $ 500,000,000            
Stated interest rate   2.75%            
Collateral trust bonds | 2.40% collateral trust bonds | Subsequent Event                
Long-term debt                
Extinguishment of debt, amount $ 450,000,000              
Stated interest rate 2.40%              
Guaranteed Underwriter Program notes payable                
Long-term debt                
Long-term debt           $ 6,149,203,000 6,269,303,000  
Increase (decrease) in debt instrument           (120,000,000)    
Available under committed loan facilities           $ 1,075,000,000    
Maximum percentage of patronage capital distribution allowed           5.00%    
Guaranteed Underwriter Program notes payable | Committed loan facility                
Long-term debt                
Committed loan facility, maximum borrowing capacity               $ 550,000,000
Proceeds from issuance of long-term debt           $ 450,000,000    
Repayments of notes payable           $ 570,000,000    
Guaranteed Underwriter Program notes payable | Committed loan facility | Maximum                
Long-term debt                
Debt instrument, term (in years)           30 years    
Unsecured debt                
Long-term debt                
Long-term debt           $ 5,057,508,000 $ 4,159,577,000  
Increase (decrease) in debt instrument           $ 898,000,000    
Unsecured debt | Debt | Credit availability concentration risk                
Long-term debt                
Concentration risk, percentage           23.00% 20.00%  
Medium-term notes | 1.000% medium-term notes                
Long-term debt                
Debt instrument, face amount     $ 400,000,000          
Stated interest rate     1.00%          
Medium-term notes | Floater rate medium-term loan                
Long-term debt                
Debt instrument, face amount   $ 400,000,000 $ 350,000,000          
Medium-term notes | Floater rate medium-term loan | Secured Overnight Financing Rate (SOFR)                
Long-term debt                
Basis spread on variable rate   0.40% 0.33%          
Medium-term notes | 1.875% medium-term notes                
Long-term debt                
Debt instrument, face amount   $ 600,000,000            
Stated interest rate   1.875%