Quarterly report pursuant to Section 13 or 15(d)

Unsecured Line of Credit Payable - Borrowings and Repayments (Details)

v3.19.1
Unsecured Line of Credit Payable - Borrowings and Repayments (Details)
3 Months Ended
Mar. 31, 2019
USD ($)
Line of Credit Facility, Increase (Decrease) During the Period [Roll Forward]  
Balance at December 31, 2018 $ 188,000,000
Balance at March 31, 2019 228,000,000
Credit facility 2018  
Line of Credit Facility [Line Items]  
Line of credit, maximum borrowing capacity 1,500,000,000.0
Line of Credit | Credit facility 2018  
Line of Credit Facility [Line Items]  
Line of credit, maximum borrowing capacity 700,000,000.0
Line of Credit Facility, Increase (Decrease) During the Period [Roll Forward]  
Balance at December 31, 2018 188,000,000
Borrowings 71,000,000
Repayments (31,000,000)
Balance at March 31, 2019 $ 228,000,000