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Acquisitions and Divestitures Acquisitions (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Business Acquisitions |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  | $ 725 | $ 77 | $ 25
Goodwill, acquired during period |  | 300 | 56 |
Payments to Acquire Additional Interest in Subsidiaries |  | 14 | 132 | 0
Goodwill | $ 17,932 | 18,335 | 17,932 | 18,178
Business Acquisitions, Not Specified |  |  |  |
Business Acquisitions |  |  |  |
Business Combination, Consideration Transferred |  | 81 | 82 | 32
Payments to Acquire Businesses, Net of Cash Acquired |  | 64 | 77 | 25
Silent-Aire |  |  |  |
Business Acquisitions |  |  |  |
Business Combination, Consideration Transferred |  | 755 |  |
Payments to Acquire Businesses, Net of Cash Acquired |  | 661 |  |
Business Combination, Contingent Consideration, Liability |  | 86 |  |
Business Combination, working capital adjustment |  | 8 |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  | 250 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  | 5 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables |  | 141 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory |  | 60 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other |  | 4 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  | 33 |  |
Goodwill |  | 244 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  | 497 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets |  | 84 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  | 1,068 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable |  | 62 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accrued Compensation and Benefits |  | 6 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue |  | 32 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other |  | 12 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other |  | 196 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | 308 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  | 760 |  |
Customer Relationships | Silent-Aire |  |  |  |
Business Acquisitions |  |  |  |
Finite-lived intangible assets acquired |  | $ 291 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 19 years |  |
Technology-Based Intangible Assets | Silent-Aire |  |  |  |
Business Acquisitions |  |  |  |
Finite-lived intangible assets acquired |  | $ 116 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 13 years |  |
Miscellaneous | Silent-Aire |  |  |  |
Business Acquisitions |  |  |  |
Finite-lived intangible assets acquired |  | $ 23 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 1 year |  |
Global Products |  |  |  |
Business Acquisitions |  |  |  |
Payments to Acquire Additional Interest in Subsidiaries | 132 |  |  |
Compensation charge related to the cash settlement of equity awards | $ 39 |  |  |
Global Products | Business Acquisitions, Not Specified |  |  |  |
Business Acquisitions |  |  |  |
Goodwill, acquired during period |  |  | 21 | 11
Global Products | Silent-Aire |  |  |  |
Business Acquisitions |  |  |  |
Goodwill, acquired during period |  | $ 244 |  |
Building Solutions Asia Pacific | Business Acquisitions, Not Specified |  |  |  |
Business Acquisitions |  |  |  |
Goodwill, acquired during period |  |  |  | 8
Building Solutions EMEA/LA | Business Acquisitions, Not Specified |  |  |  |
Business Acquisitions |  |  |  |
Goodwill, acquired during period |  | 35 | $ 35 | $ 6
Building Solutions North America | Business Acquisitions, Not Specified |  |  |  |
Business Acquisitions |  |  |  |
Goodwill, acquired during period |  | 21 |  |
Trademarks [Member] | Silent-Aire |  |  |  |
Business Acquisitions |  |  |  |
Indefinite-lived Intangible Assets Acquired |  | $ 67 |  |

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