Income Taxes - Provision for Income Taxes from Continuing Operations (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Income Tax Disclosure [Abstract]
Federal	$ 225us-gaap_CurrentFederalTaxExpenseBenefit	$ 177us-gaap_CurrentFederalTaxExpenseBenefit	$ 164us-gaap_CurrentFederalTaxExpenseBenefit
State and local, including Puerto Rico	(11)	(4)	10
Foreign	217us-gaap_CurrentForeignTaxExpenseBenefit	179us-gaap_CurrentForeignTaxExpenseBenefit	241us-gaap_CurrentForeignTaxExpenseBenefit
Total, Current	431us-gaap_CurrentIncomeTaxExpenseBenefit	352us-gaap_CurrentIncomeTaxExpenseBenefit	415us-gaap_CurrentIncomeTaxExpenseBenefit
Domestic	(59)	(119)	(29)
Foreign	(35)	3	(23)
Total, Deferred	(94)us-gaap_DeferredIncomeTaxExpenseBenefit	(116)us-gaap_DeferredIncomeTaxExpenseBenefit	(52)us-gaap_DeferredIncomeTaxExpenseBenefit
Total	$ 337us-gaap_IncomeTaxExpenseBenefit	$ 236us-gaap_IncomeTaxExpenseBenefit	$ 363us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred foreign income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.