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Debt - Unsecured Revolving Credit Facility (Details) - Unsecured debt
3 Months Ended
Mar. 31, 2020
USD ($)
extensionOption
Dec. 31, 2019
USD ($)
Mar. 13, 2018
USD ($)
Line of Credit Facility [Line Items]      
Outstanding borrowings $ 2,890,000,000 $ 2,475,000,000  
Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Outstanding borrowings 490,000,000 75,000,000  
Remaining borrowing capacity 110,000,000 525,000,000  
TOTAL BORROWING CAPACITY $ 600,000,000 $ 600,000,000 $ 400,000,000.0
Number of extension options | extensionOption 1    
Extension period 1 year    
Revolving Credit Facility | Minimum      
Line of Credit Facility [Line Items]      
Annual facility fee rate 0.15%    
Revolving Credit Facility | Maximum      
Line of Credit Facility [Line Items]      
Annual facility fee rate 0.30%