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Summary Of Significant Accounting Policies (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Oct. 01, 2018
Summary Of Accounting Policies [Line Items] |  |  |  |
Retained earnings | $ 24,199 | $ 23,072 |  |
Finished products | 578 | 592 |  |
Raw materials and work in process | 1,302 | 1,221 |  |
Total inventories | 1,880 | 1,813 |  |
Land | 336 | 316 |  |
Buildings | 2,219 | 2,145 |  |
Machinery and equipment | 5,645 | 5,470 |  |
Construction in progress | 471 | 439 |  |
Property, plant and equipment, at cost | 8,671 | 8,370 |  |
Less: Accumulated depreciation | 5,029 | 4,808 |  |
Property, plant and equipment, net | $ 3,642 | 3,562 |  |
Percentage of revenue from multiple deliverable arrangements | 5.00% |  |  |
Collateral balance posted | $ 0 |  |  |
Collateral held from counterparties | 0 |  |  |
Collateral balance could have been required to post | 8 |  |  |
Undistributed earnings of non-U.S. subsidiaries | $ 4,000 |  |  |
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 product warranty expenses of sales | 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 |  |  |
Retained earnings |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |
Adoption of accounting standard updates | $ 30 | 103 | $ 0 |
Accounting Standards Update 2017-07 [Member] |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |
Effect of change in accounting principal on operating results, retirement benefits |  | 40 | $ (38) |
Accounting Standards Update 2016-16 [Member] | Retained earnings |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |
Adoption of accounting standard updates |  | 3 |  |
Accounting standards update 2018-02, early adoption [Member] | Reclassification out of accumulated other comprehensive income [Member] | Retained earnings |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |
Adoption of accounting standard updates |  | $ 100 |  |
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

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