Business Segments (Product Revenue) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) segment	Mar. 31, 2020 USD ($)
Revenue from External Customer [Line Items]
Treatment And Refining Charges Included In Copper Concentrates Revenues	$ (97)	$ (80)
Royalty Expense	(63)	(20)
Export duties expense	(29)	(4)
Revenue from Contract with Customer, Excluding Assessed Tax	4,671	3,029
Revenues	$ 4,850	2,798
Number of Operating Segments | segment	4
Deferred Intercompany Profit, Percentage	25.00%
Sales [Member] | Not Designated as Hedging Instrument [Member]
Revenue from External Customer [Line Items]
Matured derivative financial instruments	$ 179	(231)
Copper In Concentrates [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,709	849
Copper Cathode [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,234	837
Refined Copper Products [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	684	542
Purchased Copper [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	218	235
Gold
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	518	270
Molybdenum
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	244	243
Other Products Or Services [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	$ 253	$ 157