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Earnings Per Share - Calculation of Undistributed Earnings (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Earnings Per Share [Abstract] |  |  |  |
Net income (loss) attributable to Cabot Corporation | $ 109 | $ 82 | $ 243 | $ 211
Less: Dividends declared on common stock | 24 | 23 | 69 | 64
Less: Dividends declared on participating securities |  |  |  | 1
Undistributed earnings (loss) | 85 | 59 | 174 | 146
Undistributed earnings (loss) allocated to common shareholders | 84 | 58 | 171 | 143
Undistributed earnings allocated to participating shareholders | $ 1 | $ 1 | $ 3 | $ 3

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