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Leases, Future Minimum Payments (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Sep. 30, 2019
Lessee, Lease, Description [Line Items]    
Operating Leases, Future Minimum Payments Due, Next Twelve Months $ 66 $ 76
Operating Leases, Future Minimum Payments, Due in Two Years 51 75
Operating Leases, Future Minimum Payments, Due in Three Years 39 60
Operating Leases, Future Minimum Payments, Due in Four Years 37 12
Operating Leases, Future Minimum Payments, Due in Five Years 34 3
Operating Leases, Future Minimum Payments, Due Thereafter 16 2
Total 243 228
Present value of future minimum lease payments, operating (9) 0
Operating present value of net minimum lease payments 234 228
Finance Lease, Liability, to be Paid, Year One 92 53
Finance Lease, Liability, to be Paid, Year Two 93 53
Finance Lease, Liability, to be Paid, Year Three 92 53
Finance Lease, Liability, to be Paid, Year Four 87 55
Finance Lease, Liability, to be Paid, Year Five 86 51
Finance Lease, Liability, Payments Due Thereafter 592 418
Finance Lease, Liability, Payment, Due 1,042 683
Finance Lease, Liability, Payment Amounts Representing Interest (476) (495)
Finance present value of net minimum lease payments 566 $ 188
Purchased Power Lease $ 89