Financial Instruments and Fair Value Measurements - Fair Values of Financial Instruments (Detail) - Recurring Fair Value Measurements - USD ($) $ in Millions	Sep. 30, 2015	Sep. 30, 2014
Assets
Institutional money market investments	$ 147	$ 1,040
Interest rate swaps	19	3
Forward exchange contracts	13	20
Total Assets	179	1,063
Liabilities
Forward exchange contracts	21	14
Commodity forward contracts	10
Contingent consideration liabilities	77	14
Total Liabilities	108	29
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Institutional money market investments	147	1,040
Interest rate swaps	0	0
Forward exchange contracts	0	0
Total Assets	147	1,040
Liabilities
Forward exchange contracts	0	0
Commodity forward contracts	0
Contingent consideration liabilities	0	0
Total Liabilities	0	0
Significant Other Observable Inputs (Level 2)
Assets
Institutional money market investments	0	0
Interest rate swaps	19	3
Forward exchange contracts	13	20
Total Assets	32	23
Liabilities
Forward exchange contracts	21	14
Commodity forward contracts	10
Contingent consideration liabilities	0	0
Total Liabilities	30	14
Significant Unobservable Inputs (Level 3)
Assets
Institutional money market investments	0	0
Interest rate swaps	0	0
Forward exchange contracts	0	0
Total Assets	0	0
Liabilities
Forward exchange contracts	0	0
Commodity forward contracts	0
Contingent consideration liabilities	77	14
Total Liabilities	$ 77	$ 14