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Notes Payable - Maturities (Details) - Notes and bonds payable - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Maturity of notes and bonds payable    
2022 $ 950  
2023 750  
2024 350  
Thereafter 4,591  
Totals $ 6,641 $ 6,318