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)