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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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