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Long-Lived Net Property, Equipment and Technology Assets Classified by Major Geographic Area (Detail) - USD ($)
$ in Millions
Sep. 30, 2017
Sep. 30, 2016
Segment Reporting Information [Line Items]    
Property, equipment and technology, net $ 2,253 $ 2,150
United States    
Segment Reporting Information [Line Items]    
Property, equipment and technology, net 2,003 1,827
International    
Segment Reporting Information [Line Items]    
Property, equipment and technology, net $ 250 $ 323