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Consolidated Statements of Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Profit or loss [abstract]    
Revenue (notes 5 and 6) $ 9,717 $ 7,243
Costs and expenses    
Cost of sales (notes 5 and 7) 6,911 5,220
General and administrative expenses (note 11) 212 265
Exploration, evaluation and project expenses (notes 5 and 8) 342 383
Impairment (reversals) charges (note 10) (1,423) 900
Loss on currency translation 109 136
Closed mine rehabilitation (note 27b) 5 (13)
Income from equity investees (note 16) (165) (46)
Other (income) expense (note 9) (3,100) 90
Income before finance items and income taxes 6,826 308
Finance costs, net (note 14) (469) (545)
Income (loss) before income taxes 6,357 (237)
Income tax expense (note 12) (1,783) (1,198)
Net income (loss) 4,574 (1,435)
Attributable to:    
Equity holders of Barrick Gold Corporation 3,969 (1,545)
Non-controlling interests (note 32) $ 605 $ 110
Earnings (loss) per share data attributable to the equity holders of Barrick Gold Corporation (note 13)    
Net income, Basic (in USD per share) $ 2.26 $ (1.32)
Net income, Diluted (in USD per share) $ 2.26 $ (1.32)