Accounting Policies - Narrative (Details) - USD ($) $ in Millions		12 Months Ended
	Oct. 31, 2025	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Research and development expenditures		$ 380	$ 426	$ 461
Advertising costs		362	327	364
Asset, held-for-sale, not part of disposal group			466
Liabilities held for sale			51
Maximum cash investments with single counterparty		205
Capital lease obligations		3	8	19
Accrued capital expenditures remaining unpaid		238	$ 302	348
Payments for capital expenditures accrued and unpaid in prior year				348	$ 324
Restricted net assets		$ 731
Goodwill, Impairment Loss, Statement of Income or Comprehensive Income [Extensible Enumeration]		Goodwill and Intangible Asset Impairment	Goodwill and Intangible Asset Impairment
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]	Goodwill and Intangible Asset Impairment
Insurance expenses		$ 50
Depreciation expense for property, plant and equipment		$ 1,015	$ 1,011	$ 967
Lessee, operating lease, option to terminate, term		1 year
Lessee, operating lease, term of contract		12 months
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]		Long Term Debt and Finance Leases (Notes 15 and 16), Long Term Debt and Finance Leases due Within One Year (Notes 15 and 16)	Long Term Debt and Finance Leases (Notes 15 and 16), Long Term Debt and Finance Leases due Within One Year (Notes 15 and 16)
Cooper Tire
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]			Goodwill and Intangible Asset Impairment
Americas
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Goodwill, Impairment Loss, Statement of Income or Comprehensive Income [Extensible Enumeration]		Goodwill and Intangible Asset Impairment	Goodwill and Intangible Asset Impairment
Asia Pacific
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Goodwill, Impairment Loss, Statement of Income or Comprehensive Income [Extensible Enumeration]		Goodwill and Intangible Asset Impairment	Goodwill and Intangible Asset Impairment
Sale of Dunlop Brand
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Asset, held-for-sale, not part of disposal group		$ 58
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Payment term (in days)		30 days
Operating lease, weighted average remaining lease term		1 year
Lessee, operating lease, renewal term		1 year
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Payment term (in days)		90 days
Operating lease, weighted average remaining lease term		50 years
Lessee, operating lease, renewal term		50 years
Prepaid Expenses and Other Current Assets
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restricted cash		$ 109	$ 54