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Discontinued Operations - Narrative (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 31, 2023 | Oct. 31, 2022 | Dec. 31, 2022 | Jun. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Pre-tax cash proceeds from divestiture of business |  |  |  |  | $ 0 | $ 17 | $ 30
Net sales |  |  |  |  | 3,205 | 5,824 | 5,304
Income taxes paid related to gain on divestitures, subsidiary restructurings and transaction fees |  |  |  |  | 2,300 |  |
Climate Technologies (excluding Therm-O-Disc) |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Noncontrolling common equity interest | 40.00% |  |  |  |  |  |
Climate Technologies (excluding Therm-O-Disc) |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Purchase price | $ 14,000 |  |  |  |  |  |
Pre-tax cash proceeds from divestiture of business | 9,700 |  |  |  |  |  |
Increase in cash proceeds for additional ownership interest | $ 200 |  |  |  |  |  |
Increase in ownership percentage | 5.00% |  |  |  |  |  |
Face value of note received | $ 2,250 |  |  |  |  |  |
Interest accrual percentage on note payable | 5.00% |  |  |  |  |  |
Ownership percentage at time of announcement | 45.00% |  |  |  |  |  |
Net sales |  |  |  |  | 3,156 | 4,976 | $ 4,401
Disposal group, pre-tax earnings |  |  |  |  |  | 1,000 |
Pretax gain |  |  |  |  |  | 10,600 |
Disposal group, gain (loss) on disposal, net of tax |  |  |  |  |  | 8,400 |
Ceased depreciation |  |  |  |  | 96 |  |
Discontinued operations costs |  |  |  |  | 57 |  |
Less: discontinued operations |  |  |  |  | 2,200 |  |
InSinkErator |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Purchase price |  | $ 3,000 |  |  |  |  |
Net sales |  |  |  |  |  | 630 |
Disposal group, pre-tax earnings |  |  |  |  |  | $ 152 |
Pretax gain |  |  | $ 2,800 |  |  |  |
Disposal group, gain (loss) on disposal, net of tax |  |  | $ 2,100 |  |  |  |
Less: discontinued operations |  |  |  |  | $ 660 |  |
Therm-O-Disc |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Pretax gain |  |  |  | $ 486 |  |  |
Disposal group, gain (loss) on disposal, net of tax |  |  |  | $ 429 |  |  |

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