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Financial Instruments and Fair Value Measurements - Fair Values of Financial Instruments (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Millions
Dec. 31, 2017
Sep. 30, 2017
Assets    
Institutional money market investments $ 4 $ 2,026
Interest rate swaps 3 7
Forward exchange contracts 3 8
Total Assets 10 2,042
Liabilities    
Interest rate swaps 6 0
Forward exchange contracts 2 7
Contingent consideration liabilities 28 13
Total Liabilities 36 20
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets    
Institutional money market investments 4 2,026
Interest rate swaps 0 0
Forward exchange contracts 0 0
Total Assets 4 2,026
Liabilities    
Interest rate swaps 0 0
Forward exchange contracts 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 3 7
Forward exchange contracts 3 8
Total Assets 6 15
Liabilities    
Interest rate swaps 6 0
Forward exchange contracts 2 7
Contingent consideration liabilities 0 0
Total Liabilities 8 7
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    
Interest rate swaps 0 0
Forward exchange contracts 0 0
Contingent consideration liabilities 28 13
Total Liabilities $ 28 $ 13