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INCOME TAXES (Reconciliation of U.S. federal statutory rate to effective tax rate) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Amount
U.S. federal statutory tax rate		$ (377)	$ (64)	$ (817)
Valuation allowancea		(210)	(149)	129
PT-FI historical tax disputes		(8)	(145)	0
Percentage depletion		104	118	141
Effect of foreign rates different than the U.S. federal statutory rate		(109)	(64)	(494)
Withholding and other impacts on foreign earnings		(193)	(55)	(232)
Adjustment to deferred taxes		0	(49)	0
Non-deductible permanent differences		0	(47)	(25)
Uncertain tax positions		(15)	(47)	(7)
U.S. tax reform		0	29	94
Foreign tax credit limitation		28	(16)	(195)
State income taxes		(2)	16	7
Cerro Verde historical tax disputese		(39)	2	(55)
Change in PT-FI tax rates	$ 504	0	0
Timok exploration project sale		53	(15)	0
Effective Income Tax Rate Reconciliation, Disposition of Asset, Amount		$ 135	0	0
Effective Income Tax Rate Reconciliation, Disposition of Asset, Percent		(8.00%)
Other items, net		$ (41)	(24)	(41)
Provision for income taxes		$ (944)	$ (510)	$ (991)
Percent
U.S. federal statutory tax rate		(21.00%)	(21.00%)	(21.00%)
Valuation allowancea		(12.00%)	(49.00%)	3.00%
PT-FI historical tax disputes		0.00%	(47.00%)	0.00%
Percentage depletion		6.00%	39.00%	4.00%
Effect of foreign rates different than the U.S. federal statutory rate		(6.00%)	(21.00%)	(13.00%)
Withholding and other impacts on foreign earnings		(11.00%)	(18.00%)	(6.00%)
Adjustment to deferred taxes			(16.00%)
Non-deductible permanent differences			15.00%	1.00%
Uncertain tax positions		(1.00%)	(15.00%)
U.S. tax reform			0.09	0.02
Foreign tax credit limitation		2.00%	(5.00%)	(5.00%)
State income taxes			6.00%	1.00%
Cerro Verde historical tax disputese		(2.00%)	1.00%	(1.00%)
Change in PT-FI tax rates				13.00%
Timok exploration project sale		3.00%	(5.00%)
Other items, net		(3.00%)	(9.00%)	(1.00%)
Provision for income taxes		(53.00%)	(166.00%)	(25.00%)
Valuation allowances		$ 4,732	$ 4,576

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