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Summary Of Significant Accounting Policies (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Oct. 01, 2019 | Oct. 01, 2018
Summary Of Accounting Policies [Line Items] |  |  |  |
Retained earnings | $ 26,047,000,000 | $ 24,955,000,000 |  |
Finished products | 616,000,000 | 584,000,000 |  |
Raw materials and work in process | 1,434,000,000 | 1,344,000,000 |  |
Total inventories | 2,050,000,000 | 1,928,000,000 |  |
Land | 359,000,000 | 350,000,000 |  |
Buildings | 2,493,000,000 | 2,335,000,000 |  |
Machinery and equipment | 6,097,000,000 | 5,907,000,000 |  |
Construction in progress | 478,000,000 | 463,000,000 |  |
Property, plant and equipment, at cost | 9,427,000,000 | 9,055,000,000 |  |
Less: Accumulated depreciation | 5,689,000,000 | 5,367,000,000 |  |
Property, plant and equipment, net | $ 3,738,000,000 | $ 3,688,000,000 |  |
Percentage of revenue from multiple deliverable arrangements | 5.00% |  |  |
Collateral balance posted | $ 0 |  |  |
Collateral held from counterparties | 0 |  |  |
Undistributed earnings of non-U.S. subsidiaries | $ 5,500,000,000 |  |  |
Minimum [Member] |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |
Warranty period (in years) | 1 year |  |  |
Maximum [Member] |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |
Warranty period (in years) | 2 years |  |  |
Percentage Of Sales On Product Warranty Expense | 1.00% |  |  |
Percentage of revenue from percentage-of-completion accounting method | 5.00% |  |  |
General duration of hedge positions is equal to or less than (in years) | 2 years |  |  |
Building [Member] | Minimum [Member] |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, useful life | 30 years |  |  |
Building [Member] | Maximum [Member] |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, useful life | 40 years |  |  |
Machinery and Equipment [Member] | Minimum [Member] |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, useful life | 8 years |  |  |
Machinery and Equipment [Member] | Maximum [Member] |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, useful life | 12 years |  |  |
Accounting Standards Update 2016-02 [Member] |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |
Operating lease right-of-use assets |  |  | $ 500,000,000 |
Total lease liabilities |  |  | $ 500,000,000 |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |
Retained earnings |  |  |  | $ 30,000,000

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