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Summary of Option Activity (Detail) $ / shares in Units, $ in Millions | 12 Months Ended
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Sep. 30, 2017 USD ($) $ / shares shares
Aggregate Intrinsic Value |  |
Stock price used to calculate aggregate intrinsic value | $ 105.24 |
Employee Stock Option |  |
Options |  |
Beginning balance | shares | 8,876,484 |
Granted | shares | 1,671,344 |
Forfeited | shares | (386,136) |
Exercised | shares | (3,045,816) |
Ending balance | shares | 7,115,876 |
Options exercisable at September 30, 2017 | shares | 4,463,008 |
Options exercisable and expected to be vested at September 30, 2017 | shares | 6,773,571 | [1]
Weighted-Average Remaining Contractual Term |  |
Outstanding at September 30, 2017 | 5 years 4 months 24 days |
Options exercisable at September 30, 2017 | 3 years 7 months 6 days |
Options exercisable and expected to vest at September 30, 2017 | 5 years 3 months 18 days | [1]
Weighted-Average Exercise Price Per Share |  |
Beginning balance | $ 38.42 |
Granted | 80.82 |
Forfeited | 75.01 |
Exercised | 29.62 |
Ending balance | 50.17 |
Options exercisable at September 30, 2017 | 33.39 |
Options exercisable and expected to vest at September 30, 2017 | $ 48.73 | [1]
Aggregate Intrinsic Value |  |
Outstanding at September 30, 2017 | $ | $ 392 | [2]
Options exercisable at September 30, 2017 | $ | 321 | [2]
Options exercisable and expected to vest at September 30, 2017 | $ | $ 383 | [1],[2]
[1] | Applies a forfeiture rate to unvested options outstanding at September 30, 2017 to estimate the options expected to vest in the future.
[2] | Calculated using the closing stock price on the last trading day of fiscal 2017 of $105.24, less the option exercise price, multiplied by the number of instruments.

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- Definition 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=96867065&loc=d3e5070-113901 + Details
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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 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=96867065&loc=d3e5070-113901 + Details
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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=96867065&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + 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)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under 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)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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