v3.25.4
FINANCING AND FINANCIAL INSTRUMENTS - Derivative Financial Instruments - Classified as Level 3 (Details)
€ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2025
USD ($)
Dec. 31, 2025
EUR (€)
Dec. 31, 2024
USD ($)
Disclosure of detailed information about financial instruments [line items]      
Goodwill and intangible assets $ 5,252   $ 4,453
Reconciliation of changes in fair value measurement, liabilities [abstract]      
Beginning of period, liabilities (38,099)    
End of period, liabilities $ (41,167)   (38,099)
Ten percent increase in Hera Ermac share prices      
Disclosure of detailed information about financial instruments [line items]      
Increase (decrease) in fair value of call options from electricity forward price volatility 10.00%    
Ten percent decrease in Hera Ermac share prices      
Disclosure of detailed information about financial instruments [line items]      
Increase (decrease) in fair value of call options from electricity forward price volatility 10.00%    
Ten percent increase in forward prices      
Disclosure of detailed information about financial instruments [line items]      
Increase (decrease) in fair value of call options from electricity forward price volatility 12.00%    
Ten percent decrease in forward prices      
Disclosure of detailed information about financial instruments [line items]      
Increase (decrease) in fair value of call options from electricity forward price volatility 15.00%    
Emission rights      
Disclosure of detailed information about financial instruments [line items]      
Goodwill and intangible assets $ 181   246
Electricity option      
Disclosure of detailed information about financial instruments [line items]      
Electricity option, percentage of opt-out volumes to be acquired 51.00% 51.00%  
Fair value of options, observable input, coupon yield | €   € 0  
Level 3 | Electricity option      
Reconciliation of changes in fair value measurement, liabilities [abstract]      
Beginning of period, liabilities $ (32)   (82)
Change in fair value (3)   50
End of period, liabilities $ (35)   $ (32)