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SUBSEQUENT EVENTS (Details)
Jan. 30, 2020
USD ($)
Sep. 25, 2017
Feb. 26, 2020
USD ($)
Feb. 14, 2020
USD ($)
Dec. 31, 2019
USD ($)
Extension
Dec. 31, 2018
USD ($)
Committed Loan Repurchase Facility            
Subsequent Event [Line Items]            
Committed financing         $ 1,750,000,000 $ 1,750,000,000
Committed Loan Repurchase Facility | Maturing on 19 December 2022            
Subsequent Event [Line Items]            
Committed financing         $ 600,000,000  
Number of extension maturity periods | Extension         2  
Senior Unsecured Notes | Senior Notes Due 2027            
Subsequent Event [Line Items]            
Debt instrument, minimum number of days to give notice for redemption without penalty   15 days        
Debt instrument, maximum number of days to give notice for redemption without penalty   60 days        
Subsequent Event | Committed Loan Repurchase Facility | Maturing on 19 December 2022            
Subsequent Event [Line Items]            
Committed financing       $ 500,000,000.0    
Subsequent Event | Committed Loan Repurchase Facility | Maturing On February 26 2021 | Maximum            
Subsequent Event [Line Items]            
Committed financing     $ 350,000,000.0      
Subsequent Event | Committed Loan Repurchase Facility | Maturing On February 26 2021 | Minimum            
Subsequent Event [Line Items]            
Committed financing     $ 250,000,000.0      
Number of extension maturity periods     3      
Subsequent Event | Senior Unsecured Notes | Senior Notes Due 2027            
Subsequent Event [Line Items]            
Debt issued $ 750,000,000.0          
Stated interest rate on debt instrument 4.25%          
Debt instrument, minimum number of days to give notice for redemption without penalty 15 days          
Debt instrument, maximum number of days to give notice for redemption without penalty 60 days