Accumulated Other Comprehensive Income - Amounts Reclassified Out of Accumulated Other Comprehensive Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	$ 80	[1]	$ 74	[1]	$ 237	[1]	$ 154	[1]
Tax impact	(20)		(16)		(51)		(52)
Income from continuing operations	58		61		184		111
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax					1		3
Tax impact							(2)
Income from continuing operations					1		1
Reclassification out of Accumulated Other Comprehensive Income [Member] | Pension and Other Postretirement Benefit Liability Adjustment [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of actuarial losses					3		5
Amortization of prior service cost					$ (2)		$ (2)

[1] Income (loss) from continuing operations before taxes that are categorized as Unallocated and Other includes: