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Earnings Per Share - Calculation of Undistributed Earnings (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Earnings Per Share [Abstract] |  |  |  |
Net income (loss) attributable to Cabot Corporation | $ 82 | $ 97 | $ 211 | $ 115
Less: Dividends declared on common stock | 23 | 21 | 64 | 63
Less: Dividends declared on participating securities |  |  | 1 | 1
Undistributed earnings (loss) | 59 | 76 | 146 | 51
Undistributed earnings (loss) allocated to common shareholders | 58 | 75 | 143 | 50
Undistributed earnings allocated to participating shareholders | $ 1 | $ 1 | $ 3 | $ 1

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