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Business Segments (Product Revenue) (Details) $ in Millions	3 Months Ended		6 Months Ended
Business Segments (Product Revenue) (Details) $ in Millions	Jun. 30, 2026 USD ($) operation segment	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($) operation segment	Jun. 30, 2025 USD ($)
Revenue from External Customer [Line Items]
Royalty expense	$ (60)	$ (135)	$ (113)	$ (203)
Treatment chargesc	(8)	(16)	(10)	(43)
PT-FI export duties	0	(146)	0	(202)
Revenues from contracts with customers	6,917	7,526	13,171	13,100
Revenues	$ 7,029	7,582	$ 13,263	13,310
Export duty to be paid, percent			7.50%
Number of Divisions \| segment	4		4
NumberOfReportableSegmentsNotDisclosedFlag			Operating segments
Sales \| Not Designated as Hedging Instrument
Revenue from External Customer [Line Items]
Matured derivative financial instruments	$ 112	56	$ 92	210
Copper Cathode
Revenue from External Customer [Line Items]
Revenue	2,647	2,173	4,697	4,198
Refined Copper Products
Revenue from External Customer [Line Items]
Revenue	1,533	969	3,037	1,929
Copper In Concentrates
Revenue from External Customer [Line Items]
Revenue	976	2,023	2,059	3,409
Purchased Copper
Revenue from External Customer [Line Items]
Revenue	164	173	253	471
Molybdenum
Revenue from External Customer [Line Items]
Revenue	$ 728	479	$ 1,341	921
Molybdenum \| UNITED STATES
Revenue from External Customer [Line Items]
Number Of Operations \| operation	2		2
Gold
Revenue from External Customer [Line Items]
Revenue	$ 640	1,833	$ 1,332	2,308
Silver And Other
Revenue from External Customer [Line Items]
Revenue	$ 297	$ 173	$ 575	$ 312
Copper \| UNITED STATES
Revenue from External Customer [Line Items]
Number Of Operations \| operation	7		7
Copper \| South America
Revenue from External Customer [Line Items]
Number Of Operations \| operation	2		2
Copper \| Morenci
Revenue from External Customer [Line Items]
Noncontrolling interest, ownership percentage by parent	72.00%		72.00%
Copper \| PT-FI
Revenue from External Customer [Line Items]
Noncontrolling interest, ownership percentage by parent	66.00%		66.00%