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FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured on Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Assets $ 46,528 $ 46,506
Recurring fair value measurement    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Assets (liabilities) 5,847  
Recurring fair value measurement | Cash and equivalents    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Assets 5,138  
Recurring fair value measurement | Other investments    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Assets 377  
Recurring fair value measurement | Derivatives    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Assets 50  
Recurring fair value measurement | Receivables from provisional copper and gold sales    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Assets 282  
Level 1 of fair value hierarchy [member] | Recurring fair value measurement    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Assets (liabilities) 5,515  
Level 1 of fair value hierarchy [member] | Recurring fair value measurement | Cash and equivalents    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Assets 5,138  
Level 1 of fair value hierarchy [member] | Recurring fair value measurement | Other investments    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Assets 377  
Level 1 of fair value hierarchy [member] | Recurring fair value measurement | Derivatives    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Assets 0  
Level 1 of fair value hierarchy [member] | Recurring fair value measurement | Receivables from provisional copper and gold sales    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Assets 0  
Significant other observable inputs (Level 2) | Recurring fair value measurement    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Assets (liabilities) 332  
Significant other observable inputs (Level 2) | Recurring fair value measurement | Cash and equivalents    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Assets 0  
Significant other observable inputs (Level 2) | Recurring fair value measurement | Other investments    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Assets 0  
Significant other observable inputs (Level 2) | Recurring fair value measurement | Derivatives    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Assets 50  
Significant other observable inputs (Level 2) | Recurring fair value measurement | Receivables from provisional copper and gold sales    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Assets 282  
Significant Unobservable Inputs (Level 3) | Recurring fair value measurement    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Assets (liabilities) 0  
Significant Unobservable Inputs (Level 3) | Recurring fair value measurement | Cash and equivalents    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Assets 0  
Significant Unobservable Inputs (Level 3) | Recurring fair value measurement | Other investments    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Assets 0  
Significant Unobservable Inputs (Level 3) | Recurring fair value measurement | Derivatives    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Assets 0  
Significant Unobservable Inputs (Level 3) | Recurring fair value measurement | Receivables from provisional copper and gold sales    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Assets $ 0