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Financial Instruments and Fair Value Measurements - Fair Values of Financial Instruments (Detail) - Recurring Fair Value Measurements - USD ($)
$ in Millions
Sep. 30, 2017
Sep. 30, 2016
Assets    
Institutional money market investments $ 2,026 $ 224
Interest rate swaps 7 23
Forward exchange contracts 8 3
Total Assets 2,042 249
Liabilities    
Interest rate swaps 0 18
Forward exchange contracts 7 13
Contingent consideration liabilities 13 54
Total Liabilities 20 86
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets    
Institutional money market investments 2,026 224
Interest rate swaps 0 0
Forward exchange contracts 0 0
Total Assets 2,026 224
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 7 23
Forward exchange contracts 8 3
Total Assets 15 25
Liabilities    
Interest rate swaps 0 18
Forward exchange contracts 7 13
Contingent consideration liabilities 0 0
Total Liabilities 7 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    
Interest rate swaps 0 0
Forward exchange contracts 0 0
Contingent consideration liabilities 13 54
Total Liabilities $ 13 $ 54