Financial Instruments and Fair Value Measurements - Fair Values of Financial Instruments (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Sep. 30, 2013
Assets
Institutional money market investments	$ 985	$ 881
Interest rate swaps	4
Forward exchange contracts	4	13
Total Assets	993	895
Liabilities
Forward exchange contracts	8	7
Contingent consideration liabilities	24	23
Total Liabilities	31	30
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets
Institutional money market investments	985	881
Total Assets	985	881
Significant Other Observable Inputs (Level 2) [Member]
Assets
Interest rate swaps	4
Forward exchange contracts	4	13
Total Assets	8	13
Liabilities
Forward exchange contracts	8	7
Total Liabilities	8	7
Significant Unobservable Inputs (Level 3) [Member]
Liabilities
Contingent consideration liabilities	24	23
Total Liabilities	$ 24	$ 23