Quarterly report pursuant to Section 13 or 15(d)

CONTINGENCIES AND COMMITMENTS - Additional Information - (Details)

v3.20.2
CONTINGENCIES AND COMMITMENTS - Additional Information - (Details) - USD ($)
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Loss Contingencies [Line Items]    
Standby letters of credit drawn $ 21,500,000 $ 321,000,000
Standby Letters of Credit    
Loss Contingencies [Line Items]    
Standby letters of credit drawn 0  
Surety Bond    
Loss Contingencies [Line Items]    
Issued surety bonds $ 500,438  
Extended term for surety bonds (in years) 1 year  
Surety bonds renewal amount $ 400,000  
Surety bonds renewal amount, not applicable 100,438  
State And Federal Agencies | Standby Letters of Credit    
Loss Contingencies [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 260,000  
Extended term under letter of credit arrangement (in years) 1 year  
Electric Utility Companies | Standby Letters of Credit    
Loss Contingencies [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 500,438