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EQUITY - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
 6 Months Ended
Jun. 05, 2025
Jun. 30, 2025
Dec. 31, 2024
Feb. 28, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Common stock, shares authorized (in shares)   4,000,000,000    
Common stock, par or stated value per share (in dollars per share)   $ 0.01    
Treasury shares (in shares)   98,888,958 70,093,639  
Stock repurchase program, authorized amount       $ 7,100
Stock repurchase program, shares repurchased in period (in shares)   28,800,000    
Stock repurchase program, shares repurchased in period   $ 1,900    
Remaining authorized repurchase amount   $ 1,300    
Viessmann Holdco        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stock repurchase program, authorized amount $ 300      
Stock repurchase program, authorized (in shares) 4,267,425      
Treasury stock price per share (in dollars per share) $ 70.30      
Stock repurchase program, share repurchase liability $ 300      
Common Stock        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Common stock, shares, issued (in shares)   949,712,403 948,068,772