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Earnings Per Share - Calculation of Undistributed Earnings (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Earnings Per Share [Abstract] |  |  |
Net income (loss) attributable to Cabot Corporation | $ 380 | $ 445 | $ 209
Less: Dividends declared on common stock | 92 | 87 | 84
Less: Dividends and dividend equivalents to participating securities | 1 | 1 | 1
Undistributed earnings (loss) | 287 | 357 | 124
Undistributed earnings (loss) allocated to common shareholders | 282 | 350 | 122
Undistributed earnings allocated to participating securities | $ 5 | $ 7 | $ 2

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