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Commitments and Contingencies Commitments and Contingencies - Leases (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Leases |  |  |
Operating lease expense | $ 97 | $ 92 | $ 90
2018 | 50 |  |
CT and QTE outstanding leaseback obligation | 263 | $ 301 |
2018 | 53 |  |
2018 | 76 |  |
2019 | 75 |  |
2020 | 60 |  |
2021 | 12 |  |
2022 | 3 |  |
Thereafter | 2 |  |
Total | 228 |  |
2019 | 53 |  |
2020 | 53 |  |
2021 | 55 |  |
2022 | 51 |  |
Thereafter | 418 |  |
Total | 683 |  |
Less: amount representing interest | (495) |  |
Total | 188 |  |
2019 | 207 |  |
2020 | 25 |  |
2021 | 0 |  |
2022 | 0 |  |
Thereafter | 0 |  |
Total | $ 282 |  |

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