SUPPLEMENTARY MINERAL RESERVE INFORMATION (UNAUDITED) (Ore Reserves) (Details) oz in Millions, lb in Millions, T in Millions	Dec. 31, 2021 g lb T oz
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Amount of ore reserves (in metric tons of ore) | T	16,501
Productive Land [Member] | Morenci
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Amount of ore reserves (in metric tons of ore) | T	3,918
Average ore grade of copper per metric ton	0.23%
Average ore grade of gold per metric ton (in grams per metric ton) | g	0
Average ore grade of molybdenum per metric ton	0.00%
Productive Land [Member] | Bagdad [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Amount of ore reserves (in metric tons of ore) | T	2,534
Average ore grade of copper per metric ton	0.32%
Average ore grade of gold per metric ton (in grams per metric ton) | g	0
Average ore grade of molybdenum per metric ton	0.02%
Productive Land [Member] | Safford [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Amount of ore reserves (in metric tons of ore) | T	685
Average ore grade of copper per metric ton	0.45%
Average ore grade of gold per metric ton (in grams per metric ton) | g	0
Average ore grade of molybdenum per metric ton	0.00%
Productive Land [Member] | Sierrita [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Amount of ore reserves (in metric tons of ore) | T	2,430
Average ore grade of copper per metric ton	0.23%
Average ore grade of gold per metric ton (in grams per metric ton) | g	0
Average ore grade of molybdenum per metric ton	0.02%
Productive Land [Member] | Tyrone [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Amount of ore reserves (in metric tons of ore) | T	19
Average ore grade of copper per metric ton	0.28%
Average ore grade of gold per metric ton (in grams per metric ton) | g	0
Average ore grade of molybdenum per metric ton	0.00%
Productive Land [Member] | Chino [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Amount of ore reserves (in metric tons of ore) | T	308
Average ore grade of copper per metric ton	0.44%
Average ore grade of gold per metric ton (in grams per metric ton) | g	0.0003
Average ore grade of molybdenum per metric ton	0.00%
Productive Land [Member] | Miami [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Amount of ore reserves (in metric tons of ore) | T	0
Average ore grade of copper per metric ton	0.00%
Average ore grade of gold per metric ton (in grams per metric ton) | g	0
Average ore grade of molybdenum per metric ton	0.00%
Productive Land [Member] | Henderson [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Amount of ore reserves (in metric tons of ore) | T	54
Average ore grade of copper per metric ton	0.00%
Average ore grade of gold per metric ton (in grams per metric ton) | g	0
Average ore grade of molybdenum per metric ton	0.16%
Productive Land [Member] | Climax [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Amount of ore reserves (in metric tons of ore) | T	151
Average ore grade of copper per metric ton	0.00%
Average ore grade of gold per metric ton (in grams per metric ton) | g	0
Average ore grade of molybdenum per metric ton	0.15%
Productive Land [Member] | Cerro Verde
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Amount of ore reserves (in metric tons of ore) | T	3,999
Average ore grade of copper per metric ton	0.36%
Average ore grade of gold per metric ton (in grams per metric ton) | g	0
Average ore grade of molybdenum per metric ton	0.01%
Productive Land [Member] | El Abra
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Amount of ore reserves (in metric tons of ore) | T	732
Average ore grade of copper per metric ton	0.42%
Average ore grade of gold per metric ton (in grams per metric ton) | g	0
Average ore grade of molybdenum per metric ton	0.00%
Productive Land [Member] | Big Gossan [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Amount of ore reserves (in metric tons of ore) | T	51
Average ore grade of copper per metric ton	2.26%
Average ore grade of gold per metric ton (in grams per metric ton) | g	0.0097
Average ore grade of molybdenum per metric ton	0.00%
Productive Land [Member] | Grasberg block cave [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Amount of ore reserves (in metric tons of ore) | T	857
Average ore grade of copper per metric ton	1.06%
Average ore grade of gold per metric ton (in grams per metric ton) | g	0.0071
Average ore grade of molybdenum per metric ton	0.00%
Productive Land [Member] | Deep Mill Level Zone [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Amount of ore reserves (in metric tons of ore) | T	412
Average ore grade of copper per metric ton	0.85%
Average ore grade of gold per metric ton (in grams per metric ton) | g	0.0073
Average ore grade of molybdenum per metric ton	0.00%
Undeveloped [Member] | Kucing Liar [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Amount of ore reserves (in metric tons of ore) | T	351
Average ore grade of copper per metric ton	1.03%
Average ore grade of gold per metric ton (in grams per metric ton) | g	0.0091
Average ore grade of molybdenum per metric ton	0.00%
Copper
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	110,800
Copper | Consolidated Basis [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	107,200
Copper | Net Equity Interest [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	76,200
Copper | Productive Land [Member] | Morenci
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	13,100
Copper | Productive Land [Member] | Bagdad [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	15,500
Copper | Productive Land [Member] | Safford [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	5,200
Copper | Productive Land [Member] | Sierrita [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	10,300
Copper | Productive Land [Member] | Tyrone [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	200
Copper | Productive Land [Member] | Chino [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	2,500
Copper | Productive Land [Member] | Miami [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	0
Copper | Productive Land [Member] | Henderson [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	0
Copper | Productive Land [Member] | Climax [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	0
Copper | Productive Land [Member] | Cerro Verde
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	27,900
Copper | Productive Land [Member] | El Abra
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	4,100
Copper | Productive Land [Member] | Big Gossan [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	2,300
Copper | Productive Land [Member] | Grasberg block cave [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	16,700
Copper | Productive Land [Member] | Deep Mill Level Zone [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	6,600
Copper | Undeveloped [Member] | Kucing Liar [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	6,600
Gold
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves | oz	27.1
Gold | Consolidated Basis [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves | oz	27.1
Gold | Net Equity Interest [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves | oz	14.2
Gold | Productive Land [Member] | Morenci
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves | oz	0.0
Gold | Productive Land [Member] | Bagdad [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves | oz	0.2
Gold | Productive Land [Member] | Safford [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves | oz	0.0
Gold | Productive Land [Member] | Sierrita [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves | oz	0.1
Gold | Productive Land [Member] | Tyrone [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves | oz	0.0
Gold | Productive Land [Member] | Chino [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves | oz	0.3
Gold | Productive Land [Member] | Miami [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves | oz	0.0
Gold | Productive Land [Member] | Henderson [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves | oz	0.0
Gold | Productive Land [Member] | Climax [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves | oz	0.0
Gold | Productive Land [Member] | Cerro Verde
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves | oz	0.0
Gold | Productive Land [Member] | El Abra
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves | oz	0.0
Gold | Productive Land [Member] | Big Gossan [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves | oz	1.1
Gold | Productive Land [Member] | Grasberg block cave [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves | oz	12.6
Gold | Productive Land [Member] | Deep Mill Level Zone [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves | oz	7.6
Gold | Undeveloped [Member] | Kucing Liar [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves | oz	5.3
Molybdenum
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	3,430
Molybdenum | Consolidated Basis [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	3,390
Molybdenum | Net Equity Interest [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	3,060
Molybdenum | Productive Land [Member] | Morenci
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	150
Molybdenum | Productive Land [Member] | Bagdad [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	920
Molybdenum | Productive Land [Member] | Safford [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	0
Molybdenum | Productive Land [Member] | Sierrita [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	1,020
Molybdenum | Productive Land [Member] | Tyrone [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	0
Molybdenum | Productive Land [Member] | Chino [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	0
Molybdenum | Productive Land [Member] | Miami [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	0
Molybdenum | Productive Land [Member] | Henderson [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	170
Molybdenum | Productive Land [Member] | Climax [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	460
Molybdenum | Productive Land [Member] | Cerro Verde
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	690
Molybdenum | Productive Land [Member] | El Abra
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	0
Molybdenum | Productive Land [Member] | Big Gossan [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	0
Molybdenum | Productive Land [Member] | Grasberg block cave [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	0
Molybdenum | Productive Land [Member] | Deep Mill Level Zone [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	0
Molybdenum | Undeveloped [Member] | Kucing Liar [Member]
Ore, average ore grades and recoverable proven and probable reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	0