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Business Segments (Product Revenue) (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
segment
Sep. 30, 2020
USD ($)
Revenue from External Customer [Line Items]        
Treatment And Refining Charges Included In Copper Concentrates Revenues $ (126) $ (95) $ (324) $ (250)
Royalty Expense (97) (56) (242) (102)
Export duties expense (72) (23) (145) (43)
Revenue from Contract with Customer, Excluding Assessed Tax 6,194 3,742 16,480 9,646
Revenues 6,083 3,851 $ 16,681 9,703
Number of Operating Segments | segment     4  
Deferred Intercompany Profit, Percentage     39.50%  
Sales [Member] | Not Designated as Hedging Instrument [Member]        
Revenue from External Customer [Line Items]        
Matured derivative financial instruments (111) 109 $ 201 57
Copper In Concentrates [Member]        
Revenue from External Customer [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 2,531 1,185 6,316 2,783
Copper Cathode [Member]        
Revenue from External Customer [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 1,463 1,085 4,232 3,046
Refined Copper Products [Member]        
Revenue from External Customer [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 1,048 634 2,565 1,479
Purchased Copper [Member]        
Revenue from External Customer [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 124 167 652 568
Gold        
Revenue from External Customer [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 741 497 1,856 1,108
Molybdenum        
Revenue from External Customer [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 372 189 904 626
Other Products Or Services [Member]        
Revenue from External Customer [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax $ 210 $ 159 $ 666 $ 431