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Notes Payable - Principal Maturities of Notes Payable (Details)
$ in Millions
Sep. 30, 2021
USD ($)
Maturities of Long-term Debt [Abstract]  
2021 (remaining) $ 0
2022 400
2023 0
2024 0
2025 550
Thereafter 2,150
Total long term debt $ 3,100