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FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured on Recurring Basis at Aggregate Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of fair value measurement of assets [line items]    
Assets $ 22,631 $ 25,308
Liabilities (13,246) (14,241)
Recurring fair value measurement    
Disclosure of fair value measurement of assets [line items]    
Assets (liabilities) 1,856 2,348
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) 1,780 2,267
Recurring fair value measurement | Significant Other Observable Inputs (Level 2)    
Disclosure of fair value measurement of assets [line items]    
Assets (liabilities) 76 81
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 | Derivatives    
Disclosure of fair value measurement of assets [line items]    
Liabilities 0 (29)
Recurring fair value measurement | Derivatives | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Disclosure of fair value measurement of assets [line items]    
Liabilities 0 0
Recurring fair value measurement | Derivatives | Significant Other Observable Inputs (Level 2)    
Disclosure of fair value measurement of assets [line items]    
Liabilities 0 (29)
Recurring fair value measurement | Derivatives | Significant Unobservable Inputs (Level 3)    
Disclosure of fair value measurement of assets [line items]    
Liabilities 0 0
Recurring fair value measurement | Cash and equivalents    
Disclosure of fair value measurement of assets [line items]    
Assets 1,571 2,234
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 1,571 2,234
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 209 33
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 209 33
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 | Receivables from provisional copper and gold sales [Member]    
Disclosure of fair value measurement of assets [line items]    
Assets 76 110
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 76 110
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