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Notes Payable - Maturities (Details) - Notes and bonds payable - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Maturity of notes and bonds payable    
2023 $ 750  
2024 350  
2025 500  
Thereafter 6,753  
Totals $ 8,353 $ 8,303