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Earnings Per Share - Calculation of Undistributed Earnings (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Abstract]
Net income attributable to Cabot Corporation	$ 45us-gaap_NetIncomeLoss	$ 80us-gaap_NetIncomeLoss
Less: Dividends declared on common stock	14cbt_DividendsDeclaredCommonStockEps	13cbt_DividendsDeclaredCommonStockEps
Less: Dividends declared on participating securities	0	0
Undistributed earnings	31us-gaap_UndistributedEarnings	67us-gaap_UndistributedEarnings
Undistributed earnings allocated to common shareholders	31	66
Undistributed earnings allocated to participating shareholders		$ 1

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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- Definition

The earnings that is allocated to common stock and participating securities to the extent that each security may share in earnings as if all of the earnings for the period had been distributed.

+ References+ Details