v3.25.4
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%