CONTINGENCIES (Tax Matters by Tax Year) (Details) - USD ($) $ in Millions	12 Months Ended	21 Months Ended
	Dec. 31, 2021	Dec. 21, 2018
Cerro Verde
Income Tax Examination [Line Items]
Total	$ 600.0
PT-FI
Income Tax Examination [Line Items]
Total	$ 1,100.0
Progressive export duty on copper concentrates, higher threshold, percent	5.00%	7.50%
SUNAT | Cerro Verde
Income Tax Examination [Line Items]
Tax Assessment	$ 252.0
Penalties and Interest	469.0
Total	721.0
SUNAT | 2003 to 2008 | Cerro Verde
Income Tax Examination [Line Items]
Tax Assessment	48.0
Penalties and Interest	130.0
Total	178.0
SUNAT | 2009 | Cerro Verde
Income Tax Examination [Line Items]
Tax Assessment	56.0
Penalties and Interest	52.0
Total	108.0
SUNAT | 2010 | Cerro Verde
Income Tax Examination [Line Items]
Tax Assessment	54.0
Penalties and Interest	122.0
Total	176.0
SUNAT | 2011 and 2012 | Cerro Verde
Income Tax Examination [Line Items]
Tax Assessment	41.0
Penalties and Interest	72.0
Total	113.0
SUNAT | 2013 | Cerro Verde
Income Tax Examination [Line Items]
Tax Assessment	48.0
Penalties and Interest	65.0
Total	113.0
SUNAT | 2014 to 2016 | Cerro Verde
Income Tax Examination [Line Items]
Tax Assessment	5.0
Penalties and Interest	28.0
Total	33.0
Indonesia Tax Authority | PT-FI
Income Tax Examination [Line Items]
Tax Assessment	605.0
Penalties and Interest	662.0
Total	1,267.0
Indonesia Tax Authority | 2005 | PT-FI
Income Tax Examination [Line Items]
Tax Assessment	62.0
Penalties and Interest	30.0
Total	92.0
Indonesia Tax Authority | 2007 | PT-FI
Income Tax Examination [Line Items]
Tax Assessment	48.0
Penalties and Interest	23.0
Total	71.0
Indonesia Tax Authority | 2008 and 2011 | PT-FI
Income Tax Examination [Line Items]
Tax Assessment	28.0
Penalties and Interest	36.0
Total	64.0
Indonesia Tax Authority | 2012 and 2013 | PT-FI
Income Tax Examination [Line Items]
Tax Assessment	41.0
Penalties and Interest	43.0
Total	84.0
Indonesia Tax Authority | 2014 and 2015 | PT-FI
Income Tax Examination [Line Items]
Tax Assessment	121.0
Penalties and Interest	0.0
Total	121.0
Indonesia Tax Authority | 2016 | PT-FI
Income Tax Examination [Line Items]
Tax Assessment	257.0
Penalties and Interest	483.0
Total	740.0
Indonesia Tax Authority | 2017 and 2019 | PT-FI
Income Tax Examination [Line Items]
Tax Assessment	48.0
Penalties and Interest	47.0
Total	$ 95.0