Commitments and Contingencies (Narrative) (Details) € in Millions, $ in Millions	314 Months Ended
	Dec. 31, 2025 USD ($)	Dec. 31, 2025 EUR (€)
Indemnification Agreements Hoechst [Member]
Loss Contingencies [Line Items]
Number of divestiture agreements	19	19
Indemnification floor amount | €		€ 250
Indemnification ceiling amount | €		€ 750
Indemnification percentage exceeding ceiling amount	33.33%	33.33%
Loss contingency accrual, carrying value, payments | $	$ 121
Indemnification percentage, other	33.33%	33.33%
Divestiture Agreements [Member]
Loss Contingencies [Line Items]
Guarantee obligations, maximum exposure | $	$ 103
Equity affiliates USD debt obligations | Financial Guarantee
Loss Contingencies [Line Items]
Guarantee obligations, maximum exposure | $	$ 145
Equity Affiliates EUR Debt Obligations | Financial Guarantee
Loss Contingencies [Line Items]
Guarantee obligations, maximum exposure | €		€ 31