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Business Divestitures and Assets and Liabilities Held for Sale - Narrative (Details) - USD ($) $ in Millions |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended | 21 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 05, 2025 | May 09, 2025 | May 01, 2025 | Apr. 01, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Sep. 30, 2025
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment of assets to be disposed of |  |  |  |  | $ 108 | $ 32 | $ 108 | $ 284 |  |
Pharma Solutions |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment of assets to be disposed of |  |  |  |  |  |  |  | $ 274 |  |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Pharma Solutions |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Cash proceeds from the buyer |  |  | $ 2,564 |  |  |  |  |  |  |
Maximum earnout consideration receivable |  |  | 250 |  |  |  |  |  |  |
Total assets |  |  | 2,772 |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  |  | 121 |  |  |
Loss recognized on assets-held-for-sale |  |  | $ (307) |  |  |  |  |  |  |
Income tax expense (benefit) from disposal |  |  |  |  |  |  |  |  | $ 65 | $ 79
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Nitrocellulose |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Cash proceeds from the buyer |  | $ 161 |  |  |  |  |  |  |  |
Total assets |  | $ 253 |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  |  | (10) |  |  |
Income tax expense (benefit) from disposal |  |  |  |  |  |  | (1) |  |  |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Tobacco Flavoring Business |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Cash proceeds from the buyer |  |  |  | $ 20 |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  |  | (1) |  |  |
Income tax expense (benefit) from disposal |  |  |  |  |  |  | 5 |  |  |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | SCL Disposal Group |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value of sale consideration | $ 108 |  |  |  |  |  |  |  |  |
Fair value of asset held-for-sale | 110 |  |  |  |  |  |  |  |  |
Disposal group, costs to sell | $ 2 |  |  |  |  |  |  |  |  |
Impairment of assets to be disposed of |  |  |  |  | 108 |  |  |  |  |
Income tax expense (benefit) on write down of assets held-for-sale |  |  |  |  | $ (25) |  | $ (25) |  |  |

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