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Income Taxes - Temporary Differences and Carryforwards (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Accrued expenses and reserves | $ 115 | $ 73
Employee and retiree benefits | 53 | 43
Net operating loss and other credit carryforwards | 1,072 | 751
Property, plant and equipment | 163 | 161
Intangible assets | 257 | 308
Operating lease liabilities | 80 | 0
Foreign currency adjustments | 17 | 2
Research and development | 20 | 16
Other | 3 | 5
Deferred tax assets: | 1,780 | 1,359
Valuation allowances | (1,656) | (1,304)
Deferred tax assets, net | 124 | 55
Unremitted earnings of foreign subsidiaries | 41 | 62
Operating lease right-of-use assets | 80 | 0
Deferred tax liabilities: | 121 | 62
Net deferred tax asset/(liability) | $ 3 |
Net deferred tax liabilities |  | $ (7)

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