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ACQUISITIONS AND DIVESTITURES - Narrative (Details)
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jan. 24, 2020
Rate
Jan. 01, 2020
Rate
Dec. 10, 2019
USD ($)
Rate
shares
Nov. 28, 2019
USD ($)
Rate
Sep. 17, 2019
Rate
shares
Mar. 10, 2019
Rate
Sep. 24, 2018
USD ($)
Dec. 31, 2019
USD ($)
Rate
Sep. 30, 2019
USD ($)
$ / bbl
Dec. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Rate
Jun. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Rate
Sep. 16, 2019
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jul. 18, 2019
USD ($)
Jan. 01, 2019
USD ($)
shares
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Oct. 02, 2018
shares
Disclosure of detailed information about business combination [line items]                                      
Proportion of ownership interests held by non-controlling interests   16.00%                                  
Adjustments for fair value losses (gains)                             $ (1,886,000,000) $ 0      
Acquisition-related costs for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination                             18,000,000        
Shandong Gold [Member]                                      
Disclosure of detailed information about business combination [line items]                                      
Consideration paid (received)             $ 300,000,000                        
Number of equity interests acquired (shares) | shares                                     120,000,000
Massawa [Member]                                      
Disclosure of detailed information about business combination [line items]                                      
Proportion of ownership interest sold | Rate     90.00%                                
Consideration paid (received)     $ 430,000,000                                
Cash consideration received                             (380,000,000)        
Proportion of consideration | Rate     92.50%                                
Loan issued for part financing     $ 25,000,000                                
Number of shares in entity held by entity or by its subsidiaries or associates | shares     19,164,403                                
Massawa [Member] | Teranga Gold Corporation [Member]                                      
Disclosure of detailed information about business combination [line items]                                      
Debt instruments issued     $ 225,000,000                                
Proportion of interest held by shareholders | Rate     11.45%                                
Proportion of interest held by shareholders | Rate     11.45%                                
Massawa [Member] | Cash and equivalents                                      
Disclosure of detailed information about business combination [line items]                                      
Cash consideration received     $ (300,000,000)                                
Massawa [Member] | Contingent payment [Member]                                      
Disclosure of detailed information about business combination [line items]                                      
Cash consideration received     $ (50,000,000)                                
KCGM                                      
Disclosure of detailed information about business combination [line items]                                      
Proportion of ownership interest sold | Rate       50.00%                              
Consideration paid (received)       $ 750,000,000                              
Gain (loss) on transaction       $ 408,000,000                     $ 408,000,000        
Barrick Nevada Mines [Member]                                      
Disclosure of detailed information about business combination [line items]                                      
Proportion of ownership interest in subsidiary | Rate                     100.00%                
Acacia Mining PLC                                      
Disclosure of detailed information about business combination [line items]                                      
Proportion of ownership interest sold | Rate 16.00%                                    
Proportion of interest held by shareholders | Rate         1.00%                            
Increase (decrease) through change in equity of subsidiaries, equity                 $ 70,000,000                    
Share for share exchange | shares         0.168                            
Number of shares issued | shares         24,836,670                            
Proportion of ownership interests held by non-controlling interests         36.10%                   0.00%        
Proportion of ownership interest in subsidiary   84.00%     100.00%     100.00%         63.90% 63.90%          
Mineral price (gold, in dollars per ounce; copper, in dollars per pound)                       1,200              
Proportion of interest held by shareholders | Rate         1.00%                            
Turquoise Ridge                                      
Disclosure of detailed information about business combination [line items]                                      
Proportion of ownership interests held by non-controlling interests                             38.50%        
Proportion of ownership interest in subsidiary                             61.50%        
Nevada Gold Mines                                      
Disclosure of detailed information about business combination [line items]                                      
Increase (decrease) through change in equity of subsidiaries, equity                             $ 7,555,000,000        
Proportion of ownership interests held by non-controlling interests                             39.00%        
Proportion of ownership interest in subsidiary                             61.50%        
Mineral price (gold, in dollars per ounce; copper, in dollars per pound) | $ / bbl                 1,300                    
Randgold [Member]                                      
Disclosure of detailed information about business combination [line items]                                      
Acquisition-related costs for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination                             $ 37,000,000        
Barrick Gold Corporation [Member]                                      
Disclosure of detailed information about business combination [line items]                                      
Proportion of interest held by shareholders | Rate                                   66.70%  
Proportion of interest held by shareholders | Rate                                   66.70%  
Newmont [Member]                                      
Disclosure of detailed information about business combination [line items]                                      
Consideration transferred, acquisition-date fair value                     $ 3,897,000,000                
Percentage of voting equity interests acquired | Rate           61.50%                          
Proportion of ownership interests held by non-controlling interests | Rate           38.50%                          
Non-controlling interest in acquiree recognised at acquisition date                 $ 1,645,000,000   $ 2,440,000,000   $ 1,645,000,000            
Revenue of acquiree since acquisition date                   $ 1,184,000,000                  
Revenue of combined entity as if combination occurred at beginning of period                             10,745,000,000        
Profit (loss) of combined entity as if combination occurred at beginning of period                             4,500,000,000        
Profit (loss) of acquiree since acquisition date                   322,000,000                  
Acquisition-related costs for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination                             30,000,000        
Randgold Corporation [Member]                                      
Disclosure of detailed information about business combination [line items]                                      
Consideration transferred, acquisition-date fair value                                   $ 7,909,000,000  
Percentage of voting equity interests acquired | Rate                                   100.00%  
Share for share exchange | shares                                   6.1280  
Non-controlling interest in acquiree recognised at acquisition date                                   $ 872,000,000  
Revenue of acquiree since acquisition date                             1,390,000,000        
Profit (loss) of acquiree since acquisition date                             241,000,000        
Acquisition-related costs for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination                             37,000,000        
Number of instruments or interests issued or issuable | shares                                   583,669,178  
Fair value of acquired receivables                                   $ 193,000,000  
Tax claims related to foreign operations               $ 275,000,000   275,000,000         275,000,000     $ 267.7  
Taxes recoverable               60,000,000   60,000,000         60,000,000        
Randgold Corporation [Member] | Randgold Corporation [Member]                                      
Disclosure of detailed information about business combination [line items]                                      
Proportion of interest held by shareholders | Rate                                   33.30%  
Proportion of interest held by shareholders | Rate                                   33.30%  
Turquoise Ridge                                      
Disclosure of detailed information about business combination [line items]                                      
Proportion of ownership interest in joint venture | Rate                     75.00%                
MALI | Randgold [Member]                                      
Disclosure of detailed information about business combination [line items]                                      
Tax claims related to foreign operations               $ 92,000,000   $ 92,000,000 $ 275,000,000       $ 92,000,000     $ 267,700,000  
Taxes recoverable                                 $ 60,000,000 41,100,000  
Fair value of taxes recoverable                                   $ 0.0