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Acquisitions - Additional Information (Detail) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 5 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 31, 2026 | Oct. 31, 2024 | Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2026 | Jun. 30, 2025
Business Acquisition [Line Items] |  |  |  |  |  |  |
Businesses acquisition, net of cash acquired |  |  |  |  |  | $ 66 |
Segment revenues from external customers |  |  | $ 982 | $ 923 |  | 2,735 | $ 2,814
Carbon Black Manufacturing Facility [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business combination, voting equity interest acquired, percentage | 100.00% |  |  |  |  |  |
Business acquisition, purchase price allocated to identifiable assets on relative fair value basis | $ 68 |  |  |  |  |  |
Business acquisition, purchase price allocation, property, plants and equipment | 34 |  |  |  |  |  |
Business acquisition, cash consideration | 68 |  |  |  |  |  |
Businesses acquisition, net of cash acquired | $ 2 |  |  |  |  |  |
Business combination, effective date of acquisition | Jan. 31, 2026 |  |  |  |  |  |
Acquisition and integration costs incurred |  |  |  |  |  | $ 2 |
Segment revenues from external customers |  |  |  |  | $ 26 |  |
Certain Assets and Licensed Related Technology [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business acquisition, purchase price allocated to identifiable assets on relative fair value basis |  | $ 27 |  |  |  |  |
Business acquisition, purchase price allocation, property, plants and equipment |  | 19 |  |  |  |  |
Business acquisition, purchase price allocation, intangible assets |  | $ 8 |  |  |  |  |

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