Pension, Savings and Other Postretirement Benefit Plans - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Purchase of group annuity contract	$ 142
Rationalizations	194	$ 86	$ 502
Prescription drug subsidy (less than)	$ 1
Benefit obligation discounted cash flows using a weighted average discount rate	3.10%	3.20%
Defined contribution plans, contribution expenses	$ 118	$ 134	131
Off-The-Road ("OTR") Tire Business
Defined Benefit Plan Disclosure [Line Items]
Net termination benefits/curtailment charges	1
Employee Severance
Defined Benefit Plan Disclosure [Line Items]
Net termination benefits/curtailment charges	$ 4
Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	94.00%
Defined Benefit Plan Private Credit And Private Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	6.00%
Fulda Tire Manufacturing Facility
Defined Benefit Plan Disclosure [Line Items]
Rationalizations			1
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Pension settlement charges	$ 126
Service cost	27
Benefits for certain participant	7
Actuarial (loss) gain	1	1
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	2	2
Actuarial (loss) gain	(4)	11
Benefits cost (credit)	(2)	6	8
Funded status at end of year	(231)	(232)
United States
Defined Benefit Plan Disclosure [Line Items]
Reduction of U.S. other postretirement benefit obligation		28
United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Settlement (charges) credit	(201)	3	(40)
Service cost	6	7	8
Actuarial (loss) gain	(96)	107
Benefits cost (credit)	268	67	$ 104
Funded status at end of year	$ 77	$ 67
Discount rate for determining interest cost	5.06%	5.07%	5.34%
Expected long term return on plan assets	6.20%	5.95%	6.27%
United States | Pension Plans | Retirement Plan Name Cooper Tire Salary Plan
Defined Benefit Plan Disclosure [Line Items]
Fund future obligations		$ 5	$ 18
United States | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Benefits cost (credit)	$ (3)	3	$ 5
Funded status at end of year	$ 148	$ 153
Discount rate for determining interest cost	5.29%	5.08%	5.37%
Non-U.S. | Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	90.00%
Non-U.S. | Defined Benefit Plan, Cash, Equity Securities And Real Estate Funds
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	10.00%
Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 15	$ 19	$ 18
Actuarial (loss) gain	48	131
Benefits cost (credit)	47	55	$ 59
Funded status at end of year	$ (215)	$ (205)
Discount rate for determining interest cost	4.90%	4.19%	4.72%
Expected long term return on plan assets	5.21%	4.63%	4.79%
Non-U.S. | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Benefits cost (credit)	$ 1	$ 3	$ 3
Funded status at end of year	$ 83	$ 79
Discount rate for determining interest cost	7.32%	8.04%	7.64%