STOCK-BASED COMPENSATION PLANS - Ultimate parent corporation stock option plan (Details) - Ultimate parent corporation stock option plan |
12 Months Ended |
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Dec. 31, 2025
shares
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| STOCK-BASED COMPENSATION PLANS | |
| Exercisable period | 10 years |
| Class B | |
| STOCK-BASED COMPENSATION PLANS | |
| Number of shares authorized to issue under stock-based compensation plans | 26,000,000 |
| Vesting period 3 years | |
| STOCK-BASED COMPENSATION PLANS | |
| Percentage of stock options vested | 33.33% |
| Vesting period 4 years | |
| STOCK-BASED COMPENSATION PLANS | |
| Percentage of stock options vested | 66.67% |
| Vesting period 5 years | |
| STOCK-BASED COMPENSATION PLANS | |
| Percentage of stock options vested | 100.00% |
| Options would vest equally over three years | |
| STOCK-BASED COMPENSATION PLANS | |
| Vesting period of share based awards (in years) | 3 years |
| Annual vesting percent of share based awards | 33.33% |