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Income Taxes - Summary of Temporary Differences of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Deferred tax assets |  |  |
Foreign net operating loss carryforwards | [1] | $ 36 | $ 39
Employee benefit obligations |  | 29 | 28
Environmental, self-insurance and litigation reserves (net of receivables) |  | 114 | 119
State net operating loss carryforwards (net of unrecognized tax benefits) | [2] | 38 | 48
Compensation accruals |  | 28 | 31
Credit carryforwards (net of unrecognized tax benefits) | [3] | 10 | 10
Other items |  | 38 | 32
Valuation allowances | [4] | (83) | (79)
Total deferred tax assets |  | 210 | 228
Deferred tax liabilities |  |  |
Goodwill and other intangibles | [5] | 243 | 269
Property, plant and equipment |  | 207 | 217
Unremitted earnings |  | 1 | 0
Total deferred tax liabilities |  | 451 | 486
Net deferred tax liability |  | $ (241) | $ (258)
[1] | Gross net operating loss carryforwards of $133 million will expire in future years beyond 2021 or have no expiration.
[2] | Apportioned net operating loss carryforwards generated of $0.9 billion will expire in future years as follows: $48 million in 2020, $57 million in 2021 and the remaining balance in other future years.
[3] | Credit carryforwards consist primarily of foreign tax credits of $4 million expiring in future years beyond 2020, and miscellaneous tax credits that will expire in 2024 or other future years.
[4] | Valuation allowances primarily relate to certain state and foreign net operating loss carryforwards.
[5] | The total gross amount of goodwill as of September 30, 2019 expected to be deductible for tax purposes is $8 million.

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