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Business Segments (Segment Reporting) (Details) lb in Millions, $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended	9 Months Ended
	Apr. 30, 2020 lb	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($) $ / lb	Jun. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) segment	Sep. 30, 2020 USD ($) $ / lb	Dec. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of Operating Segments | segment					4
Deferred Intercompany Profit, Percentage					39.50%
Revenues		$ 6,083	$ 3,851		$ 16,681	$ 9,703
Cost of Goods Sold, Excluding Depreciation, Depletion, and Amortization (Deprecated 2019-01-31)		(3,009)	(2,465)		(8,862)	(7,404)
Cost, Depreciation, Amortization and Depletion		528	394		1,430	1,093
Metals inventory adjustments		14	9		15	92
Selling, general and administrative expenses		(102)	(72)		(289)	(273)
Mining exploration and research expenses		15	8		36	42
Environmental obligations and shutdown costs		13	21		51	58
Net gain on sales of assets		(60)	2		(63)	13
Operating income		2,462	880		6,061	728
Interest expense, net		138	120		431	362
Provision for (benefit from) income taxes		628	297		1,674	333
Total assets		46,917	41,099		46,917	41,099	$ 42,144
Capital expenditures		541	436		1,344	1,573
Foreign Tax Authority [Member]
Segment Reporting Information [Line Items]
Change in valuation allowance		(69)			$ 69
Cerro Verde [Member]
Segment Reporting Information [Line Items]
Percent of Hourly Employees					6500.00%
Operating Segments | North America
Segment Reporting Information [Line Items]
Revenues		80	16		$ 224	61
Cost of Goods Sold, Excluding Depreciation, Depletion, and Amortization (Deprecated 2019-01-31)		(904)	(768)		(2,578)	(2,415)
Cost, Depreciation, Amortization and Depletion		94	91		275	272
Metals inventory adjustments		13	(4)		13	52
Selling, general and administrative expenses		(1)	(1)		(3)	(3)
Mining exploration and research expenses		1	0		1	2
Environmental obligations and shutdown costs		(2)	(3)		(1)	(3)
Net gain on sales of assets		0	0		0	0
Operating income		800	384		2,134	469
Interest expense, net		1	0		1	2
Provision for (benefit from) income taxes		0	0		0	0
Total assets		7,830	7,791		7,830	7,791
Capital expenditures		116	66		211	398
Operating Segments | South America
Segment Reporting Information [Line Items]
Revenues		1,128	740		3,233	1,791
Cost of Goods Sold, Excluding Depreciation, Depletion, and Amortization (Deprecated 2019-01-31)		(630)	(477)		(1,769)	(1,449)
Cost, Depreciation, Amortization and Depletion		111	105		306	315
Metals inventory adjustments		0	0		0	3
Selling, general and administrative expenses		(2)	(2)		(6)	(5)
Mining exploration and research expenses		0	0		0	0
Environmental obligations and shutdown costs		0	0		0	0
Net gain on sales of assets		0	0		0	0
Operating income		480	222		1,412	175
Interest expense, net		6	21		31	69
Provision for (benefit from) income taxes		221	109		577	76
Total assets		10,397	10,209		10,397	10,209
Capital expenditures		47	31		94	156
Corporate And Eliminations
Segment Reporting Information [Line Items]
Revenues		434	266		1,168	780
Cost of Goods Sold, Excluding Depreciation, Depletion, and Amortization (Deprecated 2019-01-31)		1,630	1,034		4,141	2,676
Cost, Depreciation, Amortization and Depletion		16	21		47	51
Metals inventory adjustments		1	8		1	26
Selling, general and administrative expenses		(66)	(39)		(182)	(169)
Mining exploration and research expenses		14	8		35	40
Environmental obligations and shutdown costs		15	24		52	60
Net gain on sales of assets		(60)	2		(63)	13
Operating income		(53)	(145)		(503)	(457)
Interest expense, net		129	99		387	285
Provision for (benefit from) income taxes		26	(23)		(3)	(46)
Total assets		7,027	3,343		7,027	3,343
Capital expenditures		43	32		111	118
Intersegment
Segment Reporting Information [Line Items]
Revenues		0	0		0	0
Intersegment | North America
Segment Reporting Information [Line Items]
Revenues		1,731	1,221		4,779	3,149
Intersegment | South America
Segment Reporting Information [Line Items]
Revenues		95	66		260	156
PT Smelting | Affiliated Entity [Member]
Segment Reporting Information [Line Items]
Revenues		795	506		2,300	1,300
Freeport Cobalt | Corporate And Eliminations
Segment Reporting Information [Line Items]
Net gain on sales of assets					60
Morenci [Member] | Operating Segments | North America
Segment Reporting Information [Line Items]
Revenues		16	4		77	26
Cost of Goods Sold, Excluding Depreciation, Depletion, and Amortization (Deprecated 2019-01-31)		(312)	(308)		(932)	(1,005)
Cost, Depreciation, Amortization and Depletion		40	42		114	129
Metals inventory adjustments		13	0		13	4
Selling, general and administrative expenses		0	(1)		(1)	(2)
Mining exploration and research expenses		0	0		0	0
Environmental obligations and shutdown costs		(1)	0		0	0
Net gain on sales of assets		0	0		0	0
Operating income		363	237		1,013	359
Interest expense, net		0	0		0	2
Provision for (benefit from) income taxes		0	0		0	0
Total assets		2,586	2,654		2,586	2,654
Capital expenditures		42	21		74	92
Morenci [Member] | Intersegment | North America
Segment Reporting Information [Line Items]
Revenues		711	584		1,996	1,473
Other Mines North America Copper Mines Segment [Member] | Operating Segments | North America
Segment Reporting Information [Line Items]
Metals inventory adjustments			(4)			48
Other Individually Immaterial Operating Segments [Member] | Operating Segments | North America
Segment Reporting Information [Line Items]
Revenues		64	12		147	35
Cost of Goods Sold, Excluding Depreciation, Depletion, and Amortization (Deprecated 2019-01-31)		(592)	(460)		(1,646)	(1,410)
Cost, Depreciation, Amortization and Depletion		54	49		161	143
Metals inventory adjustments		0			0
Selling, general and administrative expenses		(1)	0		(2)	(1)
Mining exploration and research expenses		1	0		1	2
Environmental obligations and shutdown costs		(1)	(3)		(1)	(3)
Net gain on sales of assets		0	0		0	0
Operating income		437	147		1,121	110
Interest expense, net		1	0		1	0
Provision for (benefit from) income taxes		0	0		0	0
Total assets		5,244	5,137		5,244	5,137
Capital expenditures		74	45		137	306
Other Individually Immaterial Operating Segments [Member] | Operating Segments | South America
Segment Reporting Information [Line Items]
Revenues		149	108		512	312
Cost of Goods Sold, Excluding Depreciation, Depletion, and Amortization (Deprecated 2019-01-31)		(97)	(83)		(306)	(297)
Cost, Depreciation, Amortization and Depletion		10	13		34	42
Metals inventory adjustments		0	0		0	3
Selling, general and administrative expenses		0	0		0	0
Mining exploration and research expenses		0	0		0	0
Environmental obligations and shutdown costs		0	0		0	0
Net gain on sales of assets		0	0		0	0
Operating income		42	12		172	(30)
Interest expense, net		0	0		0	0
Provision for (benefit from) income taxes		24	4		62	(6)
Total assets		1,843	1,640		1,843	1,640
Capital expenditures		6	5		10	40
Other Individually Immaterial Operating Segments [Member] | Intersegment | North America
Segment Reporting Information [Line Items]
Revenues		1,020	637		2,783	1,676
Other Individually Immaterial Operating Segments [Member] | Intersegment | South America
Segment Reporting Information [Line Items]
Revenues		0	0		0	0
Cerro Verde [Member] | Operating Segments | South America
Segment Reporting Information [Line Items]
Revenues		979	632		2,721	1,479
Cost of Goods Sold, Excluding Depreciation, Depletion, and Amortization (Deprecated 2019-01-31)		(533)	(394)		(1,463)	(1,152)
Cost, Depreciation, Amortization and Depletion		101	92		272	273
Metals inventory adjustments		0	0		0	0
Selling, general and administrative expenses		(2)	(2)		(6)	(5)
Mining exploration and research expenses		0	0		0	0
Environmental obligations and shutdown costs		0	0		0	0
Net gain on sales of assets		0	0		0	0
Operating income		438	210		1,240	205
Interest expense, net		6	21		31	69
Provision for (benefit from) income taxes		197	105		515	82
Total assets		8,554	8,569		8,554	8,569
Capital expenditures		41	26		84	116
Labor and Related Expense					74
Cerro Verde [Member] | Intersegment | South America
Segment Reporting Information [Line Items]
Revenues		95	66		260	156
Grasberg Segment [Member]
Segment Reporting Information [Line Items]
Capital expenditures					904	865
Grasberg Segment [Member] | Operating Segments | Indonesia
Segment Reporting Information [Line Items]
Revenues		1,961	1,023		5,097	2,151
Cost of Goods Sold, Excluding Depreciation, Depletion, and Amortization (Deprecated 2019-01-31)		(569)	(409)		(1,552)	(1,130)
Cost, Depreciation, Amortization and Depletion		280	150		726	375
Metals inventory adjustments		0	0		0	0
Selling, general and administrative expenses		(28)	(25)		(81)	(81)
Mining exploration and research expenses		0	0		0	0
Environmental obligations and shutdown costs		0	0		0	0
Net gain on sales of assets		0	0		0	0
Operating income		1,165	442		2,927	603
Interest expense, net		1	0		8	2
Provision for (benefit from) income taxes		382	211		1,101	302
Total assets		18,592	16,858		18,592	16,858
Capital expenditures		328	297		904	865
Grasberg Segment [Member] | Intersegment | Indonesia
Segment Reporting Information [Line Items]
Revenues		81	3		189	38
Molybdenum
Segment Reporting Information [Line Items]
Capital expenditures					4	14
Molybdenum | Operating Segments
Segment Reporting Information [Line Items]
Revenues		0	0		0	0
Cost of Goods Sold, Excluding Depreciation, Depletion, and Amortization (Deprecated 2019-01-31)		(70)	(51)		(183)	(178)
Cost, Depreciation, Amortization and Depletion		19	13		51	44
Metals inventory adjustments		0	3		1	8
Selling, general and administrative expenses		0	0		0	0
Mining exploration and research expenses		0	0		0	0
Environmental obligations and shutdown costs		0	0		0	0
Net gain on sales of assets		0	0		0	0
Operating income		62	(25)		75	(59)
Interest expense, net		0	0		0	0
Provision for (benefit from) income taxes		0	0		0	0
Total assets		1,726	1,770		1,726	1,770
Capital expenditures		1	3		4	14
Molybdenum | Intersegment
Segment Reporting Information [Line Items]
Revenues		151	42		310	171
Rod and Refining Segment [Member] | Operating Segments
Segment Reporting Information [Line Items]
Revenues		1,697	1,270		4,695	3,491
Cost of Goods Sold, Excluding Depreciation, Depletion, and Amortization (Deprecated 2019-01-31)		(1,701)	(1,272)		(4,708)	(3,529)
Cost, Depreciation, Amortization and Depletion		1	6		3	14
Metals inventory adjustments		0	2		0	3
Selling, general and administrative expenses		0	0		0	0
Mining exploration and research expenses		0	0		0	0
Environmental obligations and shutdown costs		0	0		0	1
Net gain on sales of assets		0	0		0	0
Operating income		2	(2)		4	(32)
Interest expense, net		0	0		0	0
Provision for (benefit from) income taxes		0	0		0	0
Total assets		278	251		278	251
Capital expenditures		1	1		2	5
Rod and Refining Segment [Member] | Intersegment
Segment Reporting Information [Line Items]
Revenues		7	8		20	24
Atlantic Copper Smelting and Refining Segment [Member] | Operating Segments
Segment Reporting Information [Line Items]
Revenues		783	536		2,264	1,429
Cost of Goods Sold, Excluding Depreciation, Depletion, and Amortization (Deprecated 2019-01-31)		(765)	(522)		(2,213)	(1,379)
Cost, Depreciation, Amortization and Depletion		7	8		22	22
Metals inventory adjustments		0	0		0	0
Selling, general and administrative expenses		(5)	(5)		(17)	(15)
Mining exploration and research expenses		0	0		0	0
Environmental obligations and shutdown costs		0	0		0	0
Net gain on sales of assets		0	0		0	0
Operating income		6	4		12	29
Interest expense, net		1	0		4	4
Provision for (benefit from) income taxes		(1)	0		(1)	1
Total assets		1,067	877		1,067	877
Capital expenditures		5	6		18	17
Atlantic Copper Smelting and Refining Segment [Member] | Intersegment
Segment Reporting Information [Line Items]
Revenues		0	3		0	16
Corporate And Eliminations | Intersegment
Segment Reporting Information [Line Items]
Revenues		(2,065)	(1,343)		(5,558)	(3,554)
Miami smelter | Corporate And Eliminations
Segment Reporting Information [Line Items]
Cost, Maintenance						87
Indonesia Smelter
Segment Reporting Information [Line Items]
Capital expenditures					79	94
Indonesia Smelter | Corporate And Eliminations
Segment Reporting Information [Line Items]
Capital expenditures		$ 31	$ 27		$ 79	$ 94
Forward Contracts [Member]
Segment Reporting Information [Line Items]
Derivative financial instruments				$ 24
Derivative, Forward Price | $ / lb			2.34			2.34
Forward Contracts [Member] | Designated as Hedging Instrument [Member]
Segment Reporting Information [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | lb	150

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