v3.26.1
General Information - Additional Information (Details) - USD ($)
shares in Millions, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2026
Sep. 30, 2024
Jun. 30, 2026
Jun. 30, 2026
Jun. 30, 2025
May 01, 2026
Apr. 30, 2026
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]              
Acquisition of additional ownership interest in Cerro Verde     $ (109) $ (109)      
Deferred income taxes       35 $ 34    
Capital in Excess of Par Value              
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]              
Acquisition of additional ownership interest in Cerro Verde     (73) $ (73)      
Noncontrolling Interests              
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]              
Acquisition of additional ownership interest in Cerro Verde   $ (36) $ (36)        
Cerro Verde              
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]              
Shares purchased (in shares) 2.0            
Value of shares purchased $ 107            
Investment owned, percent           55.66% 55.08%
Deferred income taxes 2            
Cerro Verde | Capital in Excess of Par Value              
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]              
Acquisition of additional ownership interest in Cerro Verde (73)            
Cerro Verde | Noncontrolling Interests              
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]              
Acquisition of additional ownership interest in Cerro Verde $ (36)