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FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured on Recurring Basis at Aggregate Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of fair value measurement of assets [line items]    
Assets $ 25,308 $ 25,264
Liabilities (14,241) (14,951)
Recurring fair value measurement    
Disclosure of fair value measurement of assets [line items]    
Assets (liabilities) 2,348 2,441
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) 2,267 2,407
Recurring fair value measurement | Significant Other Observable Inputs (Level 2)    
Disclosure of fair value measurement of assets [line items]    
Assets (liabilities) 81 34
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 (29) (76)
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 (29) (76)
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 2,234 2,389
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 2,234 2,389
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    
Disclosure of fair value measurement of assets [line items]    
Assets 33 18
Recurring fair value measurement | Other investments | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Disclosure of fair value measurement of assets [line items]    
Assets 33 18
Recurring fair value measurement | Other investments | Significant Other Observable Inputs (Level 2)    
Disclosure of fair value measurement of assets [line items]    
Assets 0 0
Recurring fair value measurement | Other investments | 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    
Disclosure of fair value measurement of assets [line items]    
Assets 110 110
Recurring fair value measurement | Receivables from provisional copper and gold sales | 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 | Significant Other Observable Inputs (Level 2)    
Disclosure of fair value measurement of assets [line items]    
Assets 110 110
Recurring fair value measurement | Receivables from provisional copper and gold sales | Significant Unobservable Inputs (Level 3)    
Disclosure of fair value measurement of assets [line items]    
Assets $ 0 $ 0