v3.26.1
STOCK-BASED COMPENSATION - Quantinuum 2026 Equity Incentive Plan (Details)
Jun. 30, 2026
plan
shares
Mar. 01, 2022
segment
Nov. 29, 2021
segment
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Number of plans | plan 2    
2026 Plan | Class A      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Awards available for grant (in shares) | shares 40,899,555    
Parent-Quantinuum Plan | RSUs | Honeywell International Inc.      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Number of installments     4
Series A Common Stock Pool Plan | Class A      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Number of installments   4