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Acquisitions and Divestitures Narrative (Details) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) $ / shares | Jul. 17, 2018 USD ($) | Jul. 02, 2018 USD ($) | Dec. 01, 2017 USD ($)
Business Acquisition & Disposal [Line Items] |  |  |  |  |  |  |  |  |
Purchase price of businesses, net of cash acquired |  |  | $ 243 | $ 770 |  |  |  |  |
Net sales | $ 4,570 | $ 4,248 | 8,717 | 8,064 |  |  |  |  |
Goodwill | 6,509 |  | 6,509 |  |  | $ 6,455 |  |  |
Proceeds from divestiture of business |  |  | $ 5 | $ 221 |  |  |  |  |
Series of Individually Immaterial Business Acquisitions [Member] |  |  |  |  |  |  |  |  |
Business Acquisition & Disposal [Line Items] |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  | $ 240 |  |  |  |
Number of additional businesses acquired |  |  | 6 |  |  | 4 |  |  |
Aventics [Member] |  |  |  |  |  |  |  |  |
Business Acquisition & Disposal [Line Items] |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  | $ 425 |  |  |
Cash paid, net of cash acquired |  |  |  |  |  |  | $ 622 |  |
Goodwill |  |  |  |  |  |  | 354 |  |
Goodwill expected tax deductible amount |  |  |  |  |  |  | 20 |  |
Intangibles |  |  |  |  |  |  | $ 278 |  |
Intangible assets, weighted average useful life |  |  |  |  |  | 12 years |  |  |
Textron's Tools & Test [Member] |  |  |  |  |  |  |  |  |
Business Acquisition & Disposal [Line Items] |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  | $ 470 |  |  |
Cash paid, net of cash acquired |  |  |  |  |  |  |  | $ 810 |
Goodwill |  |  |  |  |  |  |  | 361 |
Goodwill expected tax deductible amount |  |  |  |  |  |  |  | 17 |
Intangibles |  |  |  |  |  |  |  | $ 358 |
Intangible assets, weighted average useful life |  |  |  |  |  | 14 years |  |  |
Paradigm [Member] |  |  |  |  |  |  |  |  |
Business Acquisition & Disposal [Line Items] |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  | $ 140 |  |  |
Cash paid, net of cash acquired |  |  |  |  |  |  |  |  | $ 505
Goodwill |  |  |  |  |  |  |  |  | 309
Goodwill expected tax deductible amount |  |  |  |  |  |  |  |  | 170
Intangibles |  |  |  |  |  |  |  |  | $ 238
Intangible assets, weighted average useful life |  |  |  |  |  | 11 years |  |  |
ClosetMaid [Member] |  |  |  |  |  |  |  |  |
Business Acquisition & Disposal [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from divestiture of business |  |  |  |  |  | $ 200 |  |  |
Gain (Loss) on sales of business, net of tax |  |  |  |  |  | $ (24) |  |  |
After-tax disposal gain (loss) impact on diluted earnings per share | $ / shares |  |  |  |  |  | $ (0.04) |  |  |
After-tax proceeds on sale of business |  |  |  |  |  | $ 150 |  |  |
Automation Solutions [Member] |  |  |  |  |  |  |  |  |
Business Acquisition & Disposal [Line Items] |  |  |  |  |  |  |  |  |
Goodwill | 5,421 |  | $ 5,421 |  |  | $ 5,355 |  |  |
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 | $ 672 |  | $ 672 |  |  | $ 670 |  |  |
Climate Technologies [Member] | Series of Individually Immaterial Business Acquisitions [Member] |  |  |  |  |  |  |  |  |
Business Acquisition & Disposal [Line Items] |  |  |  |  |  |  |  |  |
Number of additional businesses acquired |  |  |  |  |  | 2 |  |  |

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