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Stock-based Compensation (Details) $ / shares in Units, shares in Millions, $ in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2016 | Sep. 02, 2016 USD ($) | Sep. 30, 2018 USD ($) Plan $ / shares shares | Sep. 30, 2017 USD ($) $ / shares | Sep. 30, 2016 USD ($) $ / shares | Jan. 23, 2013 shares
Stock Based Compensation Activity [Line Items] |  |  |  |  |  |
Shares authorized for issuance under 2012 Plan (in shares) | shares |  |  |  |  |  | 76
Shares available for issuance under the 2012 Plan (in shares) | shares |  |  | 45 |  |  |
Tyco share consolidation ratio |  | 0.955 |  |  | 0.955 |
Business Combination, Consideration Transferred, Fair Value of Acquiree Equity Awards |  | $ 224 |  |  |  |
Fair Value of Acquiree Equity Awards not Earned as of Merger Date |  | $ 101 |  |  |  |
Number of share-based compensation plans | Plan |  |  | 4 |  |  |
Compensation cost charged against income from share-based compensation plans |  |  | $ 98 | $ 134 | $ 160 |
Total income tax benefit recognized for share-based compensation arrangements |  |  | 25 | 53 | 56 |
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options |  |  | 3 | 4 | 11 |
Proceeds from the exercise of stock options |  |  | $ 66 | $ 157 | $ 70 |
Employee Stock Option |  |  |  |  |  |
Stock Based Compensation Activity [Line Items] |  |  |  |  |  |
Expiration period for stock options |  |  | 10 years |  |  |
Weighted-average grant-date fair value of options granted | $ / shares |  |  | $ 7.04 | $ 7.81 | $ 13.14 |
Total intrinsic value of options exercised |  |  | $ 38 | $ 81 | $ 39 |
Proceeds from the exercise of stock options |  |  | 66 | 157 | 70 |
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted |  |  | $ 13 |  |  |
Weighted average period over which unrecognized compensation cost is expected to be recognized |  |  | 1 year 219 days |  |  |
Stock Appreciation Rights (SARs) |  |  |  |  |  |
Stock Based Compensation Activity [Line Items] |  |  |  |  |  |
Share Based Compensation, Award Modificaton, Conversion Ratio | 1.085317 |  |  |  |  |
Payments towards exercise of SARs granted |  |  | $ 3 | $ 4 | 8 |
Restricted (Nonvested) Stock |  |  |  |  |  |
Stock Based Compensation Activity [Line Items] |  |  |  |  |  |
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted |  |  | $ 80 |  |  |
Weighted average period over which unrecognized compensation cost is expected to be recognized |  |  | 1 year 292 days |  |  |
Minimum | Employee Stock Option |  |  |  |  |  |
Stock Based Compensation Activity [Line Items] |  |  |  |  |  |
Vesting period |  |  | 2 years |  |  |
Maximum | Employee Stock Option |  |  |  |  |  |
Stock Based Compensation Activity [Line Items] |  |  |  |  |  |
Vesting period |  |  | 3 years |  |  |
Maximum | Restricted (Nonvested) Stock |  |  |  |  |  |
Stock Based Compensation Activity [Line Items] |  |  |  |  |  |
Vesting period |  |  | 3 years |  |  |
Selling, general and administrative |  |  |  |  |  |
Stock Based Compensation Activity [Line Items] |  |  |  |  |  |
Compensation cost charged against income from share-based compensation plans |  |  |  |  | 121 |
Restructuring Charges [Member] |  |  |  |  |  |
Stock Based Compensation Activity [Line Items] |  |  |  |  |  |
Compensation cost charged against income from share-based compensation plans |  |  |  |  | $ 39 |

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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income 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 (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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