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Financial Instruments and Fair Value Measurements - Fair Values of Financial Instruments (Detail) - Fair Value, Measurements, Recurring - USD ($)
$ in Millions
Mar. 31, 2017
Sep. 30, 2016
Assets    
Institutional money market investments $ 20 $ 224
Interest rate swaps 7 23
Forward exchange contracts 6 3
Total Assets 32 249
Liabilities    
Forward exchange contracts 5 13
Interest rate swaps 4 18
Contingent consideration liabilities 63 54
Total Liabilities 71 86
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets    
Institutional money market investments 20 224
Interest rate swaps 0 0
Forward exchange contracts 0 0
Total Assets 20 224
Liabilities    
Forward exchange contracts 0 0
Interest rate swaps 0 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 7 23
Forward exchange contracts 6 3
Total Assets 12 25
Liabilities    
Forward exchange contracts 5 13
Interest rate swaps 4 18
Contingent consideration liabilities 0 0
Total Liabilities 8 31
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
Interest rate swaps 0 0
Contingent consideration liabilities 63 54
Total Liabilities $ 63 $ 54