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Commitments and Contingencies Commitments and Contingencies - Leases (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Leases |  |  |
Operating lease expense | $ 92 | $ 90 | $ 86
2018 | 49 |  |
CT and QTE outstanding leaseback obligation | 301 | $ 338 |
2018 | 51 |  |
2018 | 69 |  |
2019 | 64 |  |
2020 | 62 |  |
2021 | 47 |  |
2022 | 7 |  |
Thereafter | 1 |  |
Total | 250 |  |
2019 | 51 |  |
2020 | 51 |  |
2021 | 51 |  |
2022 | 51 |  |
Thereafter | 468 |  |
Total | 723 |  |
Less: amount representing interest | (541) |  |
Total | 182 |  |
2019 | 50 |  |
2020 | 207 |  |
2021 | 25 |  |
2022 | 0 |  |
Thereafter | 0 |  |
Total | $ 331 |  |

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- Definition Amount of minimum lease payments for capital leases due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 + Details
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