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Share-Based Compensation - Additional Information (Detail) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense $ 46 $ 24 $ 138 $ 91
Unrecognized compensation expense for all non-vested share-based awards 205   $ 205  
Weighted-average remaining life non-vested share-based awards     2 years  
CareFusion [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense 20   $ 37  
Unrecognized compensation expense for all non-vested share-based awards $ 52   $ 52  
Non-vested CareFusion replacement awards outstanding 2   2