Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024		Jun. 30, 2024	Sep. 30, 2025	Dec. 31, 2025		Dec. 31, 2024		Dec. 31, 2023
Tax Credit Carryforward [Line Items]
Deferred Income Taxes and Tax Credits						$ 725
Deferred Tax Assets, Tax Credit Carryforwards, Foreign						230
Asset transfers between wholly-owned foreign affiliates								$ 87		$ (839)
Other, net								(11)		(164)
Effective Income Tax Rate Reconciliation, U.S. Benefits Of Foreign Derived Intangible Income, Amount								0		72
Unrecognized Tax Benefit, Decrease resulting from changes in uncertain tax position and impacts of amended tax return filings								(2)		5
Impairment losses						1,140		1,517		0
(Income) expense not resulting in tax impact, net		$ 319						327		(9)
Tax Credit Carryforward, Valuation Allowance						240
Goodwill		5,387	[1]			$ 4,171	[2]	5,387	[1]	6,977
Tax Credit Carryforward, Expiration Date						Dec. 31, 2027
Tax Credit Carryforward, Amount						$ 240
Alternative Minimum Tax Credit Carryforwards, Before Tax						18
Mobility & Materials
Tax Credit Carryforward [Line Items]
Capital Loss Carryforwards						173
Engineered Materials
Tax Credit Carryforward [Line Items]
Impairment losses	$ 1,100	1,500			$ 1,000	1,140		1,517
Goodwill		5,025	[1]			3,782	[2]	5,025	[1]	6,602
Nutrinova Joint Venture
Tax Credit Carryforward [Line Items]
Other, net										$ 102
China
Tax Credit Carryforward [Line Items]
Asset transfers between wholly-owned foreign affiliates				$ 87
Other, net						8
Net operating loss carryforwards						$ 190
China | Minimum
Tax Credit Carryforward [Line Items]
Net operating loss carryforward expiration						Dec. 31, 2025
China | Maximum
Tax Credit Carryforward [Line Items]
Net operating loss carryforward expiration						Dec. 31, 2030
Foreign Tax Jurisdiction
Tax Credit Carryforward [Line Items]
Tax Credit Carryforward, Valuation Allowance		$ 386						$ 386
Net operating loss carryforwards						$ 5,000
UNITED STATES
Tax Credit Carryforward [Line Items]
Other, net						(3)
Goodwill impairment losses						239
US Federal [Member]
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards						$ 15
US Federal [Member] | Minimum
Tax Credit Carryforward [Line Items]
Net operating loss carryforward expiration						Dec. 31, 2036
SWITZERLAND
Tax Credit Carryforward [Line Items]
Asset transfers between wholly-owned foreign affiliates						$ 33
Other, net						19
Net operating loss carryforwards						2,000
Valuation allowance offset for State net operating loss carryforwards due to uncertain recoverability						$ 788
SWITZERLAND | Minimum
Tax Credit Carryforward [Line Items]
Net operating loss carryforward expiration						Dec. 31, 2025
SWITZERLAND | Maximum
Tax Credit Carryforward [Line Items]
Net operating loss carryforward expiration						Dec. 31, 2031
State [Member]
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards						$ 40
Valuation allowance offset for State net operating loss carryforwards due to uncertain recoverability						$ 27

[1] Includes accumulated impairment losses of $1.5 billion in the Engineered Materials segment.

[2] Includes accumulated impairment losses of $2.7 billion in the Engineered Materials segment.