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Notes Payable - Maturities (Details) - Notes and bonds payable
$ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
Maturity of notes and bonds payable  
2021 $ 250
2022 950
Thereafter 3,700
Totals $ 4,900
Weighted average interest rate 4.10%
Weighted average remaining years until maturity 9 years 8 months 12 days