Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended			36 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2013	Sep. 30, 2010
Income Taxes [Line Items]
Net tax charges related to tax settlements	$ 3,000,000	$ 1,000,000	$ 7,000,000
Foreign currency charge related to tax settlements	13,000,000
Offset of net tax benefit related to tax settlements	10,000,000
Net tax settlements and investment incentive tax credits		11,000,000	38,000,000
Tax benefits from repatriation of high taxed income		8,000,000	24,000,000
Tax settlements		3,000,000	14,000,000
Net operating loss carryforwards	807,000,000			807,000,000
Other tax credit carryforwards	108,000,000			108,000,000
Undistributed earnings	1,180,000,000			1,180,000,000
Net deferred tax assets	81,000,000			81,000,000
Tax credits	70,000,000			243,000,000
Required future taxable operating income	180,000,000
Expected term to realize deferred tax asset, years	20 years
Increased/(decreased) valuation allowance	(3,000,000)	31,000,000	12,000,000
Unrecognized tax benefits	50,000,000	55,000,000	65,000,000	50,000,000	75,000,000
Unrecognized tax benefits, recorded	34,000,000			34,000,000
Unrecognized tax benefits, not recorded	16,000,000			16,000,000
Accruals for penalties	2,000,000	3,000,000		2,000,000
Accruals for interest	14,000,000	15,000,000		14,000,000
Favorable impact on tax provision	39,000,000
Total penalties and interest	3,000,000	3,000,000	3,000,000
U.S. Management [Member]
Income Taxes [Line Items]
Net deferred tax assets	$ 63,000,000			$ 63,000,000
U.S. federal [Member] | Minimum [Member]
Income Taxes [Line Items]
Years remains subject to examination	2007
U.S. federal [Member] | Maximum [Member]
Income Taxes [Line Items]
Years remains subject to examination	2012
State Jurisdiction [Member] | Minimum [Member]
Income Taxes [Line Items]
Years remains subject to examination	2004
State Jurisdiction [Member] | Maximum [Member]
Income Taxes [Line Items]
Years remains subject to examination	2012
Non-US [Member] | Minimum [Member]
Income Taxes [Line Items]
Years remains subject to examination	2001
Non-US [Member] | Maximum [Member]
Income Taxes [Line Items]
Years remains subject to examination	2012