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ACCOUNTS RECEIVABLE AND OTHER CURRENT ASSETS (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Accounts receivable    
Amounts due from concentrate sales $ 68 $ 76
Other receivables 295 172
Accounts receivable 363 248
Other current assets    
Derivative assets 1 2
Goods and services taxes recoverable 302 182
Prepaid expenses 174 72
Other2 88 51
Other current assets 565 307
Disclosure of Trade Receivable and Other Current Assets [Line Items]    
Deferred tax assets 235 259
MALI    
Disclosure of Trade Receivable and Other Current Assets [Line Items]    
VAT and fuel tax recoverables 141 0
Tanzania    
Disclosure of Trade Receivable and Other Current Assets [Line Items]    
VAT and fuel tax recoverables 61 67
Zambia    
Disclosure of Trade Receivable and Other Current Assets [Line Items]    
VAT and fuel tax recoverables 50 60
Zambia    
Disclosure of Trade Receivable and Other Current Assets [Line Items]    
VAT and fuel tax recoverables 26 22
Dominican Republic    
Disclosure of Trade Receivable and Other Current Assets [Line Items]    
VAT and fuel tax recoverables $ 10 $ 12