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Unsecured Lines of Credit Payable - Revolving Credit Facility Unused and Available Credit (Details) - USD ($)
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Line of Credit Facility [Line Items]        
Committed capacity $ 700,000,000   $ 700,000,000 $ 700,000,000
Borrowings outstanding (157,000,000)   (55,000,000) $ 0
Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Committed capacity 700,000,000 $ 700,000,000    
Borrowings outstanding (157,000,000)   $ (55,000,000)  
Unused and available $ 543,000,000