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Leases (Tables)
12 Months Ended
Sep. 30, 2020
Leases [Abstract]  
Schedule of Present Value of Future Minimum Lease Payments
At September 30, 2020, the present value of future minimum lease payments was as follows:
September 30,
2020
(in millions)
2021$108 
2022103 
202395 
202482 
202570 
Thereafter163 
Total undiscounted lease payments621 
Less: imputed interest(51)
Present value of lease liabilities$570