v3.25.4
FINANCING AND FINANCIAL INSTRUMENTS - Risk management policy - Sensitivity Analysis - Base Metals, Energy, Freight, Emissions Right (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Reasonably possible decrease in risk variable percent (in percent) 10.00%  
Commodity price risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Reasonably possible increase in risk variable percent (in percent) 10.00% 10.00%
Reasonably possible decrease in risk variable percent (in percent)   10.00%
Commodity price risk | Base Metals    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Reasonably possible increase in risk variable, impact on income $ 2 $ 3
Reasonably possible increase in risk variable, impact on equity 11 12
Reasonably possible decrease in risk variable, impact on income (1) (3)
Reasonably possible decrease in risk variable, impact on equity (11) (12)
Commodity price risk | Iron Ore    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Reasonably possible increase in risk variable, impact on income 0 0
Reasonably possible increase in risk variable, impact on equity 1 10
Reasonably possible decrease in risk variable, impact on income 0 0
Reasonably possible decrease in risk variable, impact on equity (1) (10)
Commodity price risk | Freight    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Reasonably possible increase in risk variable, impact on income 0 0
Reasonably possible increase in risk variable, impact on equity 11 3
Reasonably possible decrease in risk variable, impact on income 0 0
Reasonably possible decrease in risk variable, impact on equity (11) (3)
Commodity price risk | Emission rights    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Reasonably possible increase in risk variable, impact on income 0 0
Reasonably possible increase in risk variable, impact on equity 0 0
Reasonably possible decrease in risk variable, impact on income 0 0
Reasonably possible decrease in risk variable, impact on equity 0 0
Commodity price risk | Energy    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Reasonably possible increase in risk variable, impact on income (20) (2)
Reasonably possible increase in risk variable, impact on equity 36 23
Reasonably possible decrease in risk variable, impact on income 21 2
Reasonably possible decrease in risk variable, impact on equity $ (36) $ (23)