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Acquisitions And Divestitures (Narrative) (Details) $ in Millions |  |  | 3 Months Ended | 12 Months Ended | 27 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Oct. 11, 2021 USD ($) | Oct. 01, 2020 USD ($) | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2023 USD ($) | Nov. 10, 2021 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchases of businesses, net of cash acquired |  |  |  |  |  |  |  |  |  |  | $ 1,611 | $ 126 | $ 469 |  |
Net sales |  |  | $ 4,947 | $ 4,697 | $ 4,431 | $ 4,161 | $ 4,558 | $ 3,914 | $ 4,162 | $ 4,151 | 18,236 | 16,785 | 18,372 |  |
Deferred tax liabilities |  |  | 1,198 |  |  |  | 933 |  |  |  | 1,198 | 933 |  |  |
Goodwill |  |  | 7,723 |  |  |  | 6,734 |  |  |  | 7,723 | 6,734 | 6,536 |  |
Net income (loss) |  |  |  |  |  |  |  |  |  |  | 2,327 | 1,990 | 2,328 |  |
Restructuring expense |  |  |  |  |  |  |  |  |  |  | 150 | 284 | 95 |  |
Amortization of intangible assets |  |  |  |  |  |  |  |  |  |  | 470 | 369 | 359 |  |
Intangible assets, net (excluding goodwill) |  |  | 2,877 |  |  |  | 2,468 |  |  |  | 2,877 | 2,468 |  |  |
Earnings before income taxes |  |  |  |  |  |  |  |  |  |  | 2,912 | 2,335 | 2,859 |  |
Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pretax periodic distribution from retained subordinated interest in Vertiv (VRT) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 600 |
Open Systems International, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Revenue Adjustment |  |  |  |  |  |  |  |  |  |  | 14 |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |
Open Systems International, Inc. [Member] | Order or Production Backlog [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  |  |  |  |  |  |  | 30 |  |  |  |
Series of Individually Immaterial Business Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchases of businesses, net of cash acquired |  |  |  |  |  |  |  |  |  |  |  | 126 | 469 |  |
Annualized sales |  |  |  |  |  |  |  |  |  |  |  | $ 50 | 300 |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  | 209 |  |
Goodwill, expected tax deductible amount |  |  |  |  |  |  |  |  |  |  |  |  | 155 |  |
Number of businesses acquired |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |
Intangibles |  |  |  |  |  |  |  |  |  |  |  |  | $ 158 |  |
Intangible assets, weighted average useful life |  |  |  |  |  |  |  |  |  |  |  |  | 9 years |  |
Automation Solutions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 6,552 |  |  |  | 5,583 |  |  |  | 6,552 | $ 5,583 | $ 5,467 |  |
Restructuring expense |  |  |  |  |  |  |  |  |  |  | 123 | $ 232 | $ 65 |  |
Automation Solutions [Member] | Open Systems International, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchases of businesses, net of cash acquired |  | $ 1,600 |  |  |  |  |  |  |  |  |  |  |  |  |
Annualized sales |  |  |  |  |  |  |  |  |  |  | 191 |  |  |  |
Deferred tax liabilities |  | 193 |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | 967 |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, expected tax deductible amount |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  | $ 783 |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, weighted average useful life |  | 11 years |  |  |  |  |  |  |  |  |  |  |  |  |
Automation Solutions [Member] | Series of Individually Immaterial Business Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of businesses acquired |  |  |  |  |  |  |  |  |  |  |  | 2 | 8 |  |
Climate Technologies [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | $ 753 |  |  |  | $ 730 |  |  |  | 753 | $ 730 | $ 668 |  |
Restructuring expense |  |  |  |  |  |  |  |  |  |  | $ 15 | $ 23 | $ 20 |  |
Climate Technologies [Member] | Series of Individually Immaterial Business Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of businesses acquired |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Periodic distribution from retained subordinated interest in Vertiv (VRT) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 438
Subsequent Event | Automation Solutions [Member] | AspenTech [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchases of businesses, net of cash acquired | $ 6,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 55.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |

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