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Summary of Option Activity (Detail)
$ / shares in Units, $ in Millions
 12 Months Ended
Sep. 30, 2016
USD ($)
$ / shares
shares
Options  
Beginning balance | shares 9,677,717
Granted | shares 1,438,048
Forfeited | shares (463,378)
Exercised | shares (1,775,903)
Ending balance | shares 8,876,484
Options exercisable at September 30, 2016 | shares 6,204,589
Options exercisable and expected to be vested at September 30, 2015 | shares 8,582,576 [1]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]  
Beginning balance $ 28.07
Granted 79.98
Forfeited 21.76
Exercised 20.00
Ending balance 38.42
Options exercisable at September 30, 2016 24.87
Options exercisable and expected to vest at September 30, 2016(2) $ 37.35 [1]
Weighted-Average Remaining Contractual Term  
Outstanding at September 30, 2016 5 years 2 months 19 days
Options exercisable at September 30, 2016 3 years 9 months 15 days
Options exercisable and expected to vest at September 30, 2016(2) 5 years 1 month 10 days [1]
Aggregate Intrinsic Value  
Outstanding at September 30, 2016 | $ $ 393
Options exercisable at September 30, 2016 | $ 359
Options exercisable and expected to vest at September 30, 2016(2) | $ $ 389 [1]
Stock price used to calculate aggregate intrinsic value $ 82.7
[1] Applies a forfeiture rate to unvested options outstanding at September 30, 2016 to estimate the options expected to vest in the future.