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Leases Lease Costs (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) Units | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) Units | Jun. 30, 2019 USD ($)
Leases [Abstract] |  |  |  |
Maximum lease term | Units | 27 |  | 27 |
Minimum lease term | Units | 1 |  | 1 |
Operating Leases, Rent Expense |  | $ 18 |  | $ 54
Operating Lease, Cost | $ 26 |  | $ 65 |
Variable Lease, Cost | 26 |  | 52 |
Short-term Lease, Cost | 2 |  | 5 |
Finance lease, amortization expense | 2 |  | 7 |
Finance Lease, Interest Expense | 9 |  | 24 |
Finance lease expenses | 11 |  | 31 |
Lease, Cost | $ 65 |  | $ 153 |
Operating Lease, Weighted Average Remaining Lease Term | 4 years |  | 4 years |
Finance Lease, Weighted Average Remaining Lease Term | 12 years |  | 12 years |
Operating Lease, Weighted Average Discount Rate, Percent | 1.60% |  | 1.60% |
Finance Lease, Weighted Average Discount Rate, Percent | 35.10% |  | 35.10% |

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- Definition Amount of interest expense on finance lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918638-209977 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971 + Details
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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
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