Equity-Based Compensation - Information about Stock Option Transactions (Detail) shares in Millions	12 Months Ended
Sep. 30, 2017 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Outstanding at beginning of year \| shares	25
Awards forfeited \| shares	(1)
Awards granted \| shares	5
Awards exercised \| shares	(5)
Outstanding at end of year \| shares	24
Exercisable at end of year \| shares	14
Weighted Average Exercise Price
Outstanding at beginning of year \| $ / shares	$ 66.91
Awards forfeited \| $ / shares	99.40
Awards granted \| $ / shares	105.20
Awards exercised \| $ / shares	52.58
Outstanding at end of year \| $ / shares	76.68
Exercisable at end of year \| $ / shares	$ 58.62

Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Exercise Price [Abstract]

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Options, Number of Shares [Roll Forward]

+ References

No definition available.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Net number of share options (or share units) granted during the period.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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- Definition

Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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- Definition

Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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