Financial Instruments and Fair Value Measurements - Fair Values of Financial Instruments (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Jun. 30, 2016	Sep. 30, 2015
Assets
Institutional money market investments	$ 404	$ 147
Interest rate swaps	27	19
Forward exchange contracts	12	13
Total Assets	442	179
Liabilities
Forward exchange contracts	8	21
Commodity forward contracts	2	10
Interest rate swaps	19
Contingent consideration liabilities	53	77
Total Liabilities	83	108
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Institutional money market investments	404	147
Interest rate swaps	0	0
Forward exchange contracts	0	0
Total Assets	404	147
Liabilities
Forward exchange contracts	0	0
Commodity forward contracts	0	0
Interest rate swaps	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	27	19
Forward exchange contracts	12	13
Total Assets	39	32
Liabilities
Forward exchange contracts	8	21
Commodity forward contracts	2	10
Interest rate swaps	19
Contingent consideration liabilities	0	0
Total Liabilities	30	30
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	0
Interest rate swaps	0
Contingent consideration liabilities	53	77
Total Liabilities	$ 53	$ 77