Business Segments (Product Revenue) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) segment	Jun. 30, 2020 USD ($)
Revenue from External Customer [Line Items]
Treatment And Refining Charges Included In Copper Concentrates Revenues	$ (101)	$ (75)	$ (198)	$ (155)
Royalty Expense	(82)	(26)	(145)	(46)
Export duties expense	(44)	(16)	(73)	(20)
Revenue from Contract with Customer, Excluding Assessed Tax	5,615	2,875	10,286	5,904
Revenues	5,748	3,054	$ 10,598	5,852
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	133	179	$ 312	(52)
Copper In Concentrates [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	2,076	749	3,785	1,598
Copper Cathode [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,535	1,124	2,769	1,961
Refined Copper Products [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	833	303	1,517	845
Purchased Copper [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	310	166	528	401
Gold
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	597	341	1,115	611
Molybdenum
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	288	194	532	437
Other Products Or Services [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	$ 203	$ 115	$ 456	$ 272