Business Segments (Segment Reporting) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	Aug. 31, 2024	Jan. 01, 2023
Segment Reporting Information [Line Items]
Revenues	$ 6,972	$ 6,790	$ 20,282	$ 19,735
Production and delivery	4,205	4,077	12,243	11,796
Depreciation, depletion and amortization (DD&A)	625	600	1,759	1,704
Selling, general and administrative expenses	131	117	412	384
Exploration and research expenses	55	38	140	115
Environmental obligations and shutdown costs	0	20	37	115
Gain on sales of assets	(16)	0	(16)	0
Operating income	1,972	1,938	5,707	5,621
Interest expense, net	(107)	(72)	(259)	(249)
Other Nonoperating Income (Expense)	59	97	158	295
Provision for (benefit from) income taxes	(669)	(737)	(2,019)	(2,003)
Equity in affiliated companies’ net (losses) earnings	(8)	10	0	14
Net income attributable to noncontrolling interests	(573)	(710)	(1,789)	(2,063)
Net loss attributable to common stockholders	674	526	1,798	1,615
Total assets	56,828	55,400	56,828	55,400	$ 54,848
Capital expenditures	1,056	1,199	3,489	3,569
Cerro Verde
Segment Reporting Information [Line Items]
Investment owned, percent						53.56%
PT Freeport Indonesia
Segment Reporting Information [Line Items]
Provision for (benefit from) income taxes				(182)
Recovery costs	43
PT Freeport Indonesia | PT Smelting
Segment Reporting Information [Line Items]
Tolling fee	39		39
PT Freeport Indonesia | FCX
Segment Reporting Information [Line Items]
Noncontrolling interest, ownership percentage by parent					81.00%		48.76%
PT Freeport Indonesia | PT Indonesia Asahan Aluminium (Persero) (Inalum) [Member]
Segment Reporting Information [Line Items]
Noncontrolling interest, ownership percentage by parent					19.00%
Operating Segments | North America
Segment Reporting Information [Line Items]
Revenues	58	52	376	152
Production and delivery	1,394	1,303	3,820	3,678
Depreciation, depletion and amortization (DD&A)	134	109	376	327
Selling, general and administrative expenses	1	1	3	3
Exploration and research expenses	15	8	40	34
Environmental obligations and shutdown costs		0	(7)	0
Gain on sales of assets	0		0
Operating income	396	170	1,052	587
Interest expense, net	0	0	(1)	(1)
Other Nonoperating Income (Expense)	2	9	4	8
Provision for (benefit from) income taxes	0	0	0	0
Equity in affiliated companies’ net (losses) earnings	0	0	0	0
Net income attributable to noncontrolling interests	0	0	0	0
Total assets	10,631	9,819	10,631	9,819
Capital expenditures	315	263	843	743
Operating Segments | South America
Segment Reporting Information [Line Items]
Revenues	1,183	1,123	3,331	3,486
Production and delivery	802	817	2,358	2,450
Depreciation, depletion and amortization (DD&A)	114	110	338	332
Selling, general and administrative expenses	2	2	6	6
Exploration and research expenses	3	2	11	11
Environmental obligations and shutdown costs		0	0	0
Gain on sales of assets	0		0
Operating income	493	385	1,338	1,164
Interest expense, net	(5)	(6)	(13)	(16)
Other Nonoperating Income (Expense)	23	20	76	49
Provision for (benefit from) income taxes	(202)	(158)	(546)	(475)
Equity in affiliated companies’ net (losses) earnings	0	0	0	0
Net income attributable to noncontrolling interests	(145)	(126)	(397)	(380)
Total assets	10,437	10,289	10,437	10,289
Capital expenditures	110	100	287	272
Corporate And Eliminations
Segment Reporting Information [Line Items]
Revenues	514	440	1,492	1,336
Production and delivery	(1,691)	(1,417)	(4,427)	(4,180)
Depreciation, depletion and amortization (DD&A)	15	14	40	47
Selling, general and administrative expenses	85	76	282	261
Exploration and research expenses	35	26	83	62
Environmental obligations and shutdown costs		20	44	115
Gain on sales of assets	(16)		(16)
Operating income	(222)	(286)	(721)	(764)
Interest expense, net	(69)	(46)	(169)	(187)
Other Nonoperating Income (Expense)	20	34	54	128
Provision for (benefit from) income taxes	(4)	47	(33)	(15)
Equity in affiliated companies’ net (losses) earnings	1	4	0	7
Net income attributable to noncontrolling interests	8	17	(33)	(19)
Total assets	4,255	4,078	4,255	4,078
Capital expenditures	59	63	166	152
Asset write-down		32		32
Abandonment obligations				99
Corporate And Eliminations | Miami Smelter
Segment Reporting Information [Line Items]
Production and delivery			73
Intersegment
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Intersegment | North America
Segment Reporting Information [Line Items]
Revenues	1,882	1,539	4,908	4,477
Intersegment | South America
Segment Reporting Information [Line Items]
Revenues	231	193	720	477
Morenci | Operating Segments | North America
Segment Reporting Information [Line Items]
Revenues	46	40	192	90
Production and delivery	499	492	1,353	1,389
Depreciation, depletion and amortization (DD&A)	55	47	151	140
Selling, general and administrative expenses	0	0	1	1
Exploration and research expenses	11	4	25	13
Environmental obligations and shutdown costs		0	(7)	0
Gain on sales of assets	0		0
Operating income	134	50	375	227
Interest expense, net	0	0	0	0
Other Nonoperating Income (Expense)	(1)	(1)	(3)	(1)
Provision for (benefit from) income taxes	0	0	0	0
Equity in affiliated companies’ net (losses) earnings	0	0	0	0
Net income attributable to noncontrolling interests	0	0	0	0
Total assets	3,289	3,172	3,289	3,172
Capital expenditures	66	48	195	139
Morenci | Intersegment | North America
Segment Reporting Information [Line Items]
Revenues	653	553	1,706	1,680
Other Individually Immaterial Operating Segments | Operating Segments | North America
Segment Reporting Information [Line Items]
Revenues	12	12	184	62
Production and delivery	895	811	2,467	2,289
Depreciation, depletion and amortization (DD&A)	79	62	225	187
Selling, general and administrative expenses	1	1	2	2
Exploration and research expenses	4	4	15	21
Environmental obligations and shutdown costs		0	0	0
Gain on sales of assets	0		0
Operating income	262	120	677	360
Interest expense, net	0	0	(1)	(1)
Other Nonoperating Income (Expense)	3	10	7	9
Provision for (benefit from) income taxes	0	0	0	0
Equity in affiliated companies’ net (losses) earnings	0	0	0	0
Net income attributable to noncontrolling interests	0	0	0	0
Total assets	7,342	6,647	7,342	6,647
Capital expenditures	249	215	648	604
Other Individually Immaterial Operating Segments | Operating Segments | South America
Segment Reporting Information [Line Items]
Revenues	204	237	599	699
Production and delivery	166	187	545	538
Depreciation, depletion and amortization (DD&A)	17	18	56	51
Selling, general and administrative expenses	0	0	1	0
Exploration and research expenses	0	(1)	2	2
Environmental obligations and shutdown costs		0	0	0
Gain on sales of assets	0		0
Operating income	26	33	122	108
Interest expense, net	0	0	0	0
Other Nonoperating Income (Expense)	6	(2)	7	11
Provision for (benefit from) income taxes	(10)	(10)	(44)	(45)
Equity in affiliated companies’ net (losses) earnings	0	0	0	0
Net income attributable to noncontrolling interests	(2)	(12)	(23)	(48)
Total assets	2,147	2,013	2,147	2,013
Capital expenditures	11	18	36	63
Other Individually Immaterial Operating Segments | Intersegment | North America
Segment Reporting Information [Line Items]
Revenues	1,229	986	3,202	2,797
Other Individually Immaterial Operating Segments | Intersegment | South America
Segment Reporting Information [Line Items]
Revenues	5	0	127	0
Cerro Verde | Operating Segments | South America
Segment Reporting Information [Line Items]
Revenues	979	886	2,732	2,787
Production and delivery	636	630	1,813	1,912
Depreciation, depletion and amortization (DD&A)	97	92	282	281
Selling, general and administrative expenses	2	2	5	6
Exploration and research expenses	3	3	9	9
Environmental obligations and shutdown costs		0	0	0
Gain on sales of assets	0		0
Operating income	467	352	1,216	1,056
Interest expense, net	(5)	(6)	(13)	(16)
Other Nonoperating Income (Expense)	17	22	69	38
Provision for (benefit from) income taxes	(192)	(148)	(502)	(430)
Equity in affiliated companies’ net (losses) earnings	0	0	0	0
Net income attributable to noncontrolling interests	(143)	(114)	(374)	(332)
Total assets	8,290	8,276	8,290	8,276
Capital expenditures	99	82	251	209
Labor and Related Expense		34		99
Cerro Verde | Intersegment | South America
Segment Reporting Information [Line Items]
Revenues	226	193	593	477
Grasberg Segment | Operating Segments | Indonesia
Segment Reporting Information [Line Items]
Revenues	2,675	2,856	7,658	7,689
Production and delivery	1,024	918	2,726	2,451
Depreciation, depletion and amortization (DD&A)	331	340	906	923
Selling, general and administrative expenses	36	32	98	93
Exploration and research expenses	2	2	5	8
Environmental obligations and shutdown costs		0	0	0
Gain on sales of assets	0		0
Operating income	1,282	1,690	3,927	4,600
Interest expense, net	(25)	(10)	(50)	(17)
Other Nonoperating Income (Expense)	16	42	47	110
Provision for (benefit from) income taxes	(466)	(625)	(1,431)	(1,524)
Equity in affiliated companies’ net (losses) earnings	(9)	6	0	7
Net income attributable to noncontrolling interests	(436)	(601)	(1,359)	(1,664)
Total assets	27,464	27,474	27,464	27,474
Capital expenditures	483	713	1,927	2,203
Remediation costs	26		56
Grasberg Segment | Operating Segments | Indonesia | Mud Rush
Segment Reporting Information [Line Items]
Production and delivery	(195)		(195)
Idle facility costs	128		128
Recovery costs	43		43
DD&A, idle facilities	24		24
Grasberg Segment | Intersegment | Indonesia
Segment Reporting Information [Line Items]
Revenues	0	126	4	386
Molybdenum
Segment Reporting Information [Line Items]
Capital expenditures			74	88
Molybdenum | Operating Segments
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Production and delivery	150	140	400	393
Depreciation, depletion and amortization (DD&A)	22	19	74	51
Selling, general and administrative expenses	0	0	0	0
Exploration and research expenses	0	0	1	0
Environmental obligations and shutdown costs		0	0	0
Gain on sales of assets	0		0
Operating income	5	(27)	59	(29)
Interest expense, net	0	0	0	0
Other Nonoperating Income (Expense)	0	0	(1)	0
Provision for (benefit from) income taxes	0	0	0	0
Equity in affiliated companies’ net (losses) earnings	0	0	0	0
Net income attributable to noncontrolling interests	0	0	0	0
Total assets	2,037	1,955	2,037	1,955
Capital expenditures	28	25	74	88
Molybdenum | Intersegment
Segment Reporting Information [Line Items]
Revenues	177	132	534	415
Rod and Refining Segment | Operating Segments
Segment Reporting Information [Line Items]
Revenues	1,774	1,560	5,090	4,742
Production and delivery	1,773	1,562	5,088	4,741
Depreciation, depletion and amortization (DD&A)	2	2	4	4
Selling, general and administrative expenses	0	0	0	0
Exploration and research expenses	0	0	0	0
Environmental obligations and shutdown costs		0	0	0
Gain on sales of assets	0		0
Operating income	11	7	27	29
Interest expense, net	0	0	0	0
Other Nonoperating Income (Expense)	(1)	(1)	(2)	(1)
Provision for (benefit from) income taxes	0	0	0	0
Equity in affiliated companies’ net (losses) earnings	0	0	0	0
Net income attributable to noncontrolling interests	0	0	0	0
Total assets	389	294	389	294
Capital expenditures	19	7	62	23
Rod and Refining Segment | Intersegment
Segment Reporting Information [Line Items]
Revenues	12	11	29	32
Atlantic Copper Smelting and Refining Segment | Operating Segments
Segment Reporting Information [Line Items]
Revenues	768	759	2,335	2,330
Production and delivery	753	754	2,278	2,263
Depreciation, depletion and amortization (DD&A)	7	6	21	20
Selling, general and administrative expenses	7	6	23	21
Exploration and research expenses	0	0	0	0
Environmental obligations and shutdown costs		0	0	0
Gain on sales of assets	0		0
Operating income	7	(1)	25	34
Interest expense, net	(8)	(10)	(26)	(28)
Other Nonoperating Income (Expense)	(1)	(7)	(20)	1
Provision for (benefit from) income taxes	3	(1)	(9)	11
Equity in affiliated companies’ net (losses) earnings	0	0	0	0
Net income attributable to noncontrolling interests	0	0	0	0
Total assets	1,615	1,491	1,615	1,491
Capital expenditures	42	28	130	88
Atlantic Copper Smelting and Refining Segment | Intersegment
Segment Reporting Information [Line Items]
Revenues	6	6	12	8
Corporate And Eliminations | Intersegment
Segment Reporting Information [Line Items]
Revenues	$ (2,308)	$ (2,007)	$ (6,207)	$ (5,795)