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FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured on Recurring Basis at Aggregate Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of fair value measurement of assets [line items]    
Assets $ 46,506 $ 44,392
Recurring fair value measurement    
Disclosure of fair value measurement of assets [line items]    
Assets (liabilities) 5,921 3,641
Recurring fair value measurement | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Disclosure of fair value measurement of assets [line items]    
Assets (liabilities) 5,616 3,572
Recurring fair value measurement | Significant Other Observable Inputs (Level 2)    
Disclosure of fair value measurement of assets [line items]    
Assets (liabilities) 305 69
Recurring fair value measurement | Significant Unobservable Inputs (Level 3)    
Disclosure of fair value measurement of assets [line items]    
Assets (liabilities) 0 0
Recurring fair value measurement | Cash and equivalents    
Disclosure of fair value measurement of assets [line items]    
Assets 5,188 3,314
Recurring fair value measurement | Cash and equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Disclosure of fair value measurement of assets [line items]    
Assets 5,188 3,314
Recurring fair value measurement | Cash and equivalents | Significant Other Observable Inputs (Level 2)    
Disclosure of fair value measurement of assets [line items]    
Assets 0 0
Recurring fair value measurement | Cash and equivalents | Significant Unobservable Inputs (Level 3)    
Disclosure of fair value measurement of assets [line items]    
Assets 0 0
Recurring fair value measurement | Other investments [Member]    
Disclosure of fair value measurement of assets [line items]    
Assets 428 258
Recurring fair value measurement | Other investments [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Disclosure of fair value measurement of assets [line items]    
Assets 428 258
Recurring fair value measurement | Other investments [Member] | Significant Other Observable Inputs (Level 2)    
Disclosure of fair value measurement of assets [line items]    
Assets 0 0
Recurring fair value measurement | Other investments [Member] | Significant Unobservable Inputs (Level 3)    
Disclosure of fair value measurement of assets [line items]    
Assets 0 0
Recurring fair value measurement | Derivatives    
Disclosure of fair value measurement of assets [line items]    
Assets 40 1
Recurring fair value measurement | Derivatives | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Disclosure of fair value measurement of assets [line items]    
Assets 0 0
Recurring fair value measurement | Derivatives | Significant Other Observable Inputs (Level 2)    
Disclosure of fair value measurement of assets [line items]    
Assets 40 1
Recurring fair value measurement | Derivatives | Significant Unobservable Inputs (Level 3)    
Disclosure of fair value measurement of assets [line items]    
Assets 0 0
Recurring fair value measurement | Receivables from provisional copper and gold sales [Member]    
Disclosure of fair value measurement of assets [line items]    
Assets 265 68
Recurring fair value measurement | Receivables from provisional copper and gold sales [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Disclosure of fair value measurement of assets [line items]    
Assets 0 0
Recurring fair value measurement | Receivables from provisional copper and gold sales [Member] | Significant Other Observable Inputs (Level 2)    
Disclosure of fair value measurement of assets [line items]    
Assets 265 68
Recurring fair value measurement | Receivables from provisional copper and gold sales [Member] | Significant Unobservable Inputs (Level 3)    
Disclosure of fair value measurement of assets [line items]    
Assets $ 0 $ 0