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DISCONTINUED OPERATIONS - Narrative (Details) - USD ($) $ in Millions |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Aug. 13, 2024 | Jun. 06, 2024 | May 31, 2023 | Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024 | Sep. 30, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Discontinued operations, net of tax of $13, $—, $22 and $—, respectively |  |  |  | $ 0 | $ (46) | $ 0 | $ (73) |
Income taxes paid related to gain on divestitures, subsidiary restructurings and transaction fees |  |  |  |  |  | $ 585 |  |
Copeland |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent |  | 40.00% | 40.00% |  |  |  |  |
Climate Technologies (excluding Therm-O-Disc) |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Other deductions, net |  |  |  |  | 59 |  | 95 |
Equity method losses |  |  |  |  | (59) |  | (95) |
Discontinued operations, net of tax of $13, $—, $22 and $—, respectively |  |  |  |  | $ (46) |  | $ (73) |
Copeland |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of equity method investments |  | $ 1,500 |  |  |  |  |  |
Disposal Group, Held-for-Sale or Disposed of by Sale, Not Discontinued Operations | 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 |  |  |  |  |
Proceeds from notes receivable |  |  | $ 2,250 |  |  |  |  |
Disposal Group, Held-for-Sale or Disposed of by Sale, Not Discontinued Operations | Copeland |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of equity method investments | $ 1,500 |  |  |  |  |  |  |
Pretax gain |  |  |  |  |  |  |  | $ 539
Gain on sale of business, net of tax |  |  |  |  |  |  |  | $ 435

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