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Stock-Based Compensation Plans (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]    
Share-based payment arrangement, expense $ 5 $ 6
Restricted Stock Units | Solstice 2025 Stock Incentive Plan    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]    
Granted (in shares) 184,911  
Share-based compensation arrangement by share-based payment award, award vesting period 3 years  
Granted (in dollars per share) $ 79.12  
Performance Stock Units | Solstice 2025 Stock Incentive Plan    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]    
Granted (in shares) 143,045  
Share-based compensation arrangement by share-based payment award, award vesting period 3 years  
Granted (in dollars per share) $ 92.42