Restructuring - Restructuring Activities and Related Reserves (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
Restructuring Cost and Reserve [Line Items]
Reserve balance	$ 20		$ 10
Charges	4	5	24	29
Costs charged against assets/liabilities	(1)		(4)
Cash paid	(2)		(9)
Reserve balance	21		21
Severance and Employee Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Reserve balance	16		7
Charges	2		15
Costs charged against assets/liabilities	0		0
Cash paid	(1)		(5)
Reserve balance	17		17
Environmental Remediation [Member]
Restructuring Cost and Reserve [Line Items]
Reserve balance	2		2
Charges	0		1
Costs charged against assets/liabilities	0		0
Cash paid	0		(1)
Reserve balance	2		2
Asset Sales [Member]
Restructuring Cost and Reserve [Line Items]
Reserve balance			0
Charges			1
Costs charged against assets/liabilities			0
Cash paid			(1)
Reserve balance	0		0
Other [Member]
Restructuring Cost and Reserve [Line Items]
Reserve balance	2		1
Charges	1		3
Costs charged against assets/liabilities	0		0
Cash paid	(1)		(2)
Reserve balance	2		2
Asset Impairment and Accelerated Depreciation [Member]
Restructuring Cost and Reserve [Line Items]
Reserve balance	0		0
Charges	1		4
Costs charged against assets/liabilities	(1)		(4)
Cash paid	0		0
Reserve balance	$ 0		$ 0