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Equity-Based Compensation - Information about Restricted Stock Unit Transactions (Detail)
shares in Millions
12 Months Ended
Sep. 30, 2017
$ / shares
shares
Units  
Unvested at beginning of year | shares 10
Granted | shares 4 [1]
Vested | shares (4)
Forfeited | shares (1)
Unvested at end of year | shares 9 [2]
Weighted Average Grant-Date Fair Value  
Unvested at beginning of year | $ / shares $ 88.84
Granted | $ / shares 105.66 [1]
Vested | $ / shares 77.15
Forfeited | $ / shares 97.85
Unvested at end of year | $ / shares $ 101.17 [2]
[1] Includes 0.2 million Performance RSUs.
[2] Includes 0.6 million Performance RSUs.