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Acquisitions and Dispositions - Components of the Preliminary Mountaineer Purchase Price Allocation (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 01, 2021
--- | --- | --- | --- | ---
Liabilities assumed: |  |  |  |
Goodwill | $ 3,027 | $ 3,612 | $ 3,770 |
Mountaineer |  |  |  |
Assets acquired: |  |  |  |
Cash and cash equivalents |  |  |  | $ 3
Accounts receivable |  |  |  | 14
Inventories |  |  |  | 41
Other current assets |  |  |  | 21
Property, plant and equipment |  |  |  | 397
Other noncurrent assets |  |  |  | 48
Total assets acquired |  |  |  | 524
Liabilities assumed: |  |  |  |
Short-term borrowings |  |  |  | 55
Accounts payable |  |  |  | 20
Other current liabilities |  |  |  | 52
Long-term debt |  |  |  | 164
Pension and other postretirement benefit obligation |  |  |  | 33
Deferred income taxes |  |  |  | 21
Other noncurrent liabilities |  |  |  | 29
Total liabilities assumed |  |  |  | 374
Goodwill |  |  |  | 250
Net consideration transferred |  |  |  | $ 400

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