INCOME AND MINING TAXES - Tax Loss Carryforwards, Foreign Tax Credits, Canadian Tax Credits, and AMT Credits (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Carryforwards
Operating loss carryforwards	$ 1,726	$ 1,754
Tax credit carryforwards	659	658
Operating loss carryforwards not subject to expiration	502	504
Canada
Carryforwards
Operating loss carryforwards subject to expiration	905
Canada | Investment Tax Credit Carryforward
Carryforwards
Tax credit carryforwards	149	134
Tax credit carryforward, subject to expiration	86
Tax credit carryforward, not subject to expiration	63
Argentina
Carryforwards
Operating loss carryforwards subject to expiration	95
Mexico
Carryforwards
Operating loss carryforwards subject to expiration	155
Other
Carryforwards
Operating loss carryforwards subject to expiration	69
United States | Foreign Tax Credits
Carryforwards
Tax credit carryforward, not subject to expiration	$ 510	$ 489