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Merger Transaction (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Sep. 02, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill, purchase accounting adjustments |  | $ (258) |
Cash and cash equivalents | $ 489 |  |
Accounts receivable | 2,034 |  |
Inventories | 807 |  |
Other current assets | 617 |  |
Property, plant, and equipment | 1,216 |  |
Goodwill, acquired during period |  | (256) | $ 16,622
Intangible assets - net | 6,384 |  |
Other noncurrent assets | 536 |  |
Total assets required | 28,188 |  |
Short term debt | 462 |  |
Accounts payable | 725 |  |
Accrued compensation and benefits | 312 |  |
Other current liabilities | 1,481 |  |
Long-term debt | 6,416 |  |
Long-term deferred tax liabilities | 718 |  |
Long-term pension and postretirement benefits | 774 |  |
Other noncurrent liabilities | 1,456 |  |
Total liabilities acquired | 12,344 |  |
Noncontrolling interests | 37 |  |
Net assets acquired | 15,807 |  |
Cash consideration paid to JCI Inc. shareholders | 3,864 | 3,900 | $ 3,864
Total fair value of consideration transferred | 19,671 | 19,700 |
Customer Relationships |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets acquired | $ 2,280 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 12 years |  |
Technology-Based Intangible Assets [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets acquired | $ 1,650 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 11 years |  |
Other Finite Lived Intangible [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets acquired | $ 214 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 7 years |  |
Indefinite-lived trademarks |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Indefinite-lived Intangible Assets Acquired | $ 2,080 |  |
Other indefinite-lived intangibles |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Indefinite-lived Intangible Assets Acquired | 90 |  |
In-process research and development |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Indefinite-lived Intangible Assets Acquired | 70 |  |
Tyco Merger [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill, acquired during period | $ 16,105 | $ 16,105 |

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