Accumulated Other Comprehensive Income (Tables)

9 Months Ended

Jun. 30, 2014

Equity [Abstract]

Changes in Each Component of Accumulated Other Comprehensive Income, Net of Tax

Changes in each component of Accumulated other comprehensive income, net of tax, are as follows:

	Currency Translation Adjustment			Unrealized Gains on Investments		Pension and Other Postretirement Benefit Liability Adjustments			Total
	(Dollars in millions)
Balance at September 30, 2013, attributable to Cabot Corporation	$	154		$	2	$	(53	)	$	103
Other comprehensive loss before reclassifications		(18	)		—		—			(18	)
Amounts reclassified from accumulated other comprehensive income		—			2		1			3
Net other comprehensive items		(18	)		2		1			(15	)
Less: Noncontrolling interest		(2	)		—		—			(2	)
Balance at June 30, 2014, attributable to Cabot Corporation	$	138		$	4	$	(52	)	$	90

Amounts Reclassified Out of Accumulated Other Comprehensive Income

The amounts reclassified out of Accumulated other comprehensive income and into the Statement of Operations for the nine months ended June 30, 2014 and 2013 are as follows:

		Nine Months Ended June 30
	Affected Line Item in the Consolidated Statements of Operations	2014			2013
		(Dollars in millions)
Pension and other postretirement benefit liability adjustment
Amortization of actuarial losses	Net Periodic Benefit Cost - see Note E for details	$	3		$	5
Amortization of prior service cost	Net Periodic Benefit Cost - see Note E for details		(2	)		(2	)
Total before tax			1			3
Tax impact	Provision for income taxes		—			(2	)
Total after tax		$	1		$	1