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Income Taxes - Deferred Taxes (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Sep. 30, 2019
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Income Tax Disclosure [Abstract] |  |
Other noncurrent assets | $ 178 | $ 199
Other noncurrent liabilities | (175) | (206)
Net deferred tax liabilities |  | $ (7)
Net deferred tax asset/(liability) | $ 3 |

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