v3.25.4
STOCK-BASED COMPENSATION - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Additional Information about Stock Options      
Total compensation expense for stock options plans $ 38,000 $ 56,000 $ 57,000
Related tax benefit $ 10,000 $ 12,000 $ 12,000
2020 EIP      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding at the beginning of the period (in shares) 509,000    
Exercised (in shares) (83,000)    
Qnity exists (in shares) (85,000)    
Share conversion (in shares) 545,000    
Forfeited/Expired (in shares) (4,000)    
Outstanding at the end of the period (in shares) 882,000 509,000  
Options exercisable, Number of options (in shares) 882,000    
Weighted Average Exercise Price (per share)      
Outstanding, weighted average exercise price, beginning balance (in USD per share) $ 74.61    
Exercised, weighted average exercise price (in USD per share) 31.47    
Qnity exists weighted average exercise price (in USD per share) 74.38    
Share conversion weighted average exercise price (in USD per share) 53.13    
Forfeited/Expired, weighted average exercise price (in USD per share) 74.08    
Outstanding, weighted average exercise price, ending balance (in USD per share) 31.58 $ 74.61  
Options exercisable, weighted average exercise price per share (in USD per share) $ 31.58    
Options outstanding, weighted average remaining contractual term 5 years 11 months 23 days    
Options outstanding, aggregate intrinsic value (in USD) $ 7,604    
Options exercisable, weighted average remaining contractual term 5 years 11 months 23 days    
Options exercisable, aggregate intrinsic value (in USD) $ 7,604    
Granted (in shares) 0 0 0
2020 EIP | Stock Options      
Additional Information about Stock Options      
Weighted-average fair value per share of options granted (in USD per share) $ 0 $ 0 $ 0
Total compensation expense for stock options plans $ 10,000 $ 10,000 $ 10,000
Related tax benefit $ 2,000 $ 2,000 $ 2,000
Dupont OIP      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding at the beginning of the period (in shares) 1,390,000    
Exercised (in shares) (292,000)    
Qnity exists (in shares) (251,000)    
Share conversion (in shares) 1,266,000    
Forfeited/Expired (in shares) (18,000)    
Outstanding at the end of the period (in shares) 2,095,000 1,390,000  
Options exercisable, Number of options (in shares) 2,095,000    
Weighted Average Exercise Price (per share)      
Outstanding, weighted average exercise price, beginning balance (in USD per share) $ 62.55    
Exercised, weighted average exercise price (in USD per share) 46.46    
Qnity exists weighted average exercise price (in USD per share) 64.02    
Share conversion weighted average exercise price (in USD per share) 43.99    
Forfeited/Expired, weighted average exercise price (in USD per share) 22.62    
Outstanding, weighted average exercise price, ending balance (in USD per share) 26.04 $ 62.55  
Options exercisable, weighted average exercise price per share (in USD per share) $ 26.04    
Options outstanding, weighted average remaining contractual term 4 years 1 month 13 days    
Options outstanding, aggregate intrinsic value (in USD) $ 29,660    
Options exercisable, weighted average remaining contractual term 4 years 1 month 13 days    
Options exercisable, aggregate intrinsic value (in USD) $ 29,660    
Granted (in shares) 0 0 0
Dupont OIP | Stock Options      
Weighted Average Exercise Price (per share)      
Granted (in shares) 0 0 0
Additional Information about Stock Options      
Total compensation expense for stock options plans $ 23,000 $ 23,000 $ 23,000
Related tax benefit $ 5,000 $ 5,000 $ 5,000
EIDP Equity Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding at the beginning of the period (in shares) 2,002,000    
Exercised (in shares) (584,000)    
Qnity exists (in shares) (58,000)    
Share conversion (in shares) 1,646,000    
Forfeited/Expired (in shares) (134,000)    
Outstanding at the end of the period (in shares) 2,872,000 2,002,000  
Options exercisable, Number of options (in shares) 2,872,000    
Weighted Average Exercise Price (per share)      
Outstanding, weighted average exercise price, beginning balance (in USD per share) $ 73.77    
Exercised, weighted average exercise price (in USD per share) 37.93    
Qnity exists weighted average exercise price (in USD per share) 88.02    
Share conversion weighted average exercise price (in USD per share) 67.07    
Forfeited/Expired, weighted average exercise price (in USD per share) 36.75    
Outstanding, weighted average exercise price, ending balance (in USD per share) 40.81 $ 73.77  
Options exercisable, weighted average exercise price per share (in USD per share) $ 40.81    
Options outstanding, weighted average remaining contractual term 1 year 8 months 12 days    
Options outstanding, aggregate intrinsic value (in USD) $ 4,881,000    
Options exercisable, weighted average remaining contractual term 1 year 8 months 12 days    
Options exercisable, aggregate intrinsic value (in USD) $ 4,881,000    
Granted (in shares) 0 0 0