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Acquisitions and Divestitures Narrative (Details) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) $ / shares | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jan. 10, 2018 USD ($) | Dec. 01, 2017 USD ($) | Apr. 28, 2017 USD ($)
Business Acquisition & Disposal [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 4,456 | $ 4,039 | $ 12,520 | $ 10,829 |  |  |  |  |  |  |
Goodwill | 5,745 |  | 5,745 |  | $ 5,745 |  |  | $ 5,316 |  |  |
Purchase price of businesses, net of cash acquired |  |  | 770 | 2,991 |  |  |  |  |  |  |
Proceeds from divestiture of businesses |  |  | $ 223 | $ 40 |  |  |  |  |  |  |
Textron's Tools & Test [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition & Disposal [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  | 470 |  |  |  |  |  |
Aventics [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition & Disposal [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  | 425 |  |  |  |  |  |
Cooper-Atkins [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition & Disposal [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash paid, net of cash acquired |  |  |  |  |  |  |  |  | $ 247 |  |
Goodwill |  |  |  |  |  |  |  |  | 114 |  |
Goodwill expected tax deductible amount |  |  |  |  |  |  |  |  | 114 |  |
Intangibles |  |  |  |  |  |  |  |  | $ 127 |  |
Intangible assets, weighted average useful life |  |  | 12 years |  |  |  |  |  |  |  |
Pentair's Valves & Controls [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition & Disposal [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash paid, net of cash acquired |  |  |  |  |  |  |  |  |  |  | $ 2,960
Net sales |  |  |  |  |  |  |  | 1,400 |  |  |
Cash acquired |  |  |  |  |  |  |  |  |  |  | $ 207
Series of Individually Immaterial Business Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition & Disposal [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of additional businesses acquired |  |  | 3 |  |  |  |  |  |  |  |
Cooper-Atkins & Series of Individually Immaterial Business Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition & Disposal [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  | $ 70 |  |  |  |  |
Paradigm [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition & Disposal [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash paid, net of cash acquired |  |  |  |  |  |  |  |  |  | $ 505 |
Net sales |  |  |  |  |  |  | $ 140 |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  | 332 |
Goodwill expected tax deductible amount |  |  |  |  |  |  |  |  |  | 160 |
Intangibles |  |  |  |  |  |  |  |  |  | $ 238 |
Intangible assets, weighted average useful life |  |  | 11 years |  |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | ClosetMaid [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition & Disposal [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture of businesses |  |  | $ 200 |  |  |  |  |  |  |  |
Gain (loss) on divestiture of business, after tax |  |  | $ (24) |  |  |  |  |  |  |  |
Disposal gain (loss) impact on diluted earnings per share | $ / shares |  |  | $ (0.04) |  |  |  |  |  |  |  |
After-tax proceeds on sale of business |  |  | $ 150 |  |  |  |  |  |  |  |
Current assets held-for-sale |  |  |  |  |  |  |  | 73 |  |  |
Other noncurrent assets held-for-sale |  |  |  |  |  |  |  | 176 |  |  |
Accrued expenses & other liabilities held-for-sale |  |  |  |  |  |  |  | 61 |  |  |
Automation Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition & Disposal [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill | 5,018 |  | $ 5,018 |  | 5,018 |  |  | 4,704 |  |  |
Automation Solutions [Member] | Series of Individually Immaterial Business Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition & Disposal [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of additional businesses acquired |  |  | 2 |  |  |  |  |  |  |  |
Climate Technologies [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition & Disposal [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 671 |  | $ 671 |  | $ 671 |  |  | $ 555 |  |  |
Climate Technologies [Member] | Series of Individually Immaterial Business Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition & Disposal [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of additional businesses acquired |  |  | 1 |  |  |  |  |  |  |  |

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