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Unsecured Line of Credit Payable - Revolving Credit Facility Unused and Available Credit (Details) - USD ($)
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Line of Credit Facility [Line Items]        
Borrowings outstanding $ (43,000,000)   $ 0  
Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Committed capacity 700,000,000     $ 700,000,000
Borrowings outstanding (43,000,000) $ 0    
Unused and available $ 657,000,000