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Leases, Future Minimum Payments (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Sep. 30, 2019
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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 |

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- Definition Amount of lessee's undiscounted obligation for lease payments for finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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