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Notes Payable - Maturities (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Maturity of notes and bonds payable    
Weighted average interest rate 2.90% 4.50%
Notes and bonds payable    
Maturity of notes and bonds payable    
2021 $ 250  
2022 950  
Thereafter 4,200  
Totals $ 5,400  
Weighted average interest rate 4.00%  
Weighted average remaining years until maturity 9 years 2 months 12 days