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Notes Payable - Maturities (Details) - Notes and bonds payable
$ in Millions
9 Months Ended
Sep. 30, 2018
USD ($)
Maturity of notes and bonds payable  
2021 $ 250
2022 950
Thereafter 4,200
Totals $ 5,400
Weighted average interest rate (as a percent) 4.00%
Weighted average remaining years until maturity 9 years