Employee Benefit Plans - Fair Value of Pension Plan Assets by Asset Category (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	$ 555		$ 530
Total Direct Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	22		73
Total Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	451		442
Alternative Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	13		12
Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	69		3
U.S. Equity Securities [Member] | Total Direct Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	22		21
Non-U.S. Government Bonds [Member] | Total Direct Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets			52
Equity Funds [Member] | Total Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	188	[1]	233	[1]
Fixed Income Funds [Member] | Total Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	253	[2]	204	[2]
Real Estate Funds [Member] | Total Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	9	[3]	1	[3]
Common and Collective Investment Trust Funds [Member] | Total Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	1	[4]	1	[4]
Money Market Funds [Member] | Total Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets			3
Insurance Contracts [Member] | Alternative Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	13	[5]	12	[5]
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	249		303
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Total Direct Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	22		73
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Total Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	158		228
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	69		2
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Equity Securities [Member] | Total Direct Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	22		21
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Non-U.S. Government Bonds [Member] | Total Direct Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets			52
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Funds [Member] | Total Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	68	[1]	132	[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fixed Income Funds [Member] | Total Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	90	[2]	93	[2]
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Money Market Funds [Member] | Total Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets			3
Significant Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	306		227
Significant Observable Inputs (Level 2) [Member] | Total Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	293		214
Significant Observable Inputs (Level 2) [Member] | Alternative Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	13		12
Significant Observable Inputs (Level 2) [Member] | Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets			1
Significant Observable Inputs (Level 2) [Member] | Equity Funds [Member] | Total Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	120	[1]	101	[1]
Significant Observable Inputs (Level 2) [Member] | Fixed Income Funds [Member] | Total Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	163	[2]	111	[2]
Significant Observable Inputs (Level 2) [Member] | Real Estate Funds [Member] | Total Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	9	[3]	1	[3]
Significant Observable Inputs (Level 2) [Member] | Common and Collective Investment Trust Funds [Member] | Total Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	1	[4]	1	[4]
Significant Observable Inputs (Level 2) [Member] | Insurance Contracts [Member] | Alternative Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	$ 13	[5]	$ 12	[5]

[1] During fiscal 2013, the Company approved the freezing of the U.S. pension plan that resulted in the remeasurement of the plan assets and liabilities. The remeasurement decreased the net pension obligation of the plan, which is included within the Other liabilities caption on the Consolidated Balance Sheets, by $19 million and increased Accumulated other comprehensive (loss) income by $13 million, net of tax. The impact to the Company's Net periodic benefit cost was less than $1 million.

[2] The fixed income funds asset class includes investments in high quality funds. High quality fixed income funds primarily invest in low risk U.S. and non-U.S. government securities, investment-grade corporate bonds, mortgages and asset-backed securities. A significant portion of the fixed income funds include investment in long-term bond funds.

[3] The real estate funds asset class includes funds that primarily invest in entities which are principally engaged in the ownership, acquisition, development, financing, sale and/or management of income-producing real estate properties, both commercial and residential. These funds typically seek long-term growth of capital and current income that is above average relative to public equity funds.

[4] The investment objective of the portfolio of this common and collective investment trust is to achieve long-term, total return in excess of the MSCI World Index Benchmark by investing in equity securities of companies worldwide, emphasizing those with above-average potential for capital appreciation.

[5] Insurance contracts held by the Company's non-U.S. plans are issued by well-known, highly rated insurance companies.