Quarterly report pursuant to Section 13 or 15(d)

Unsecured Line of Credit Payable - Revolving Credit Facility Unused and Available Credit (Details)

v3.20.1
Unsecured Line of Credit Payable - Revolving Credit Facility Unused and Available Credit (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2018
Line of Credit Facility [Line Items]      
Borrowings outstanding $ (148,000,000) $ (56,000,000)  
Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Committed capacity 700,000,000   $ 700,000,000.0
Borrowings outstanding (148,000,000) $ (56,000,000)  
Unused and available $ 552,000,000