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PROPERTY, PLANT AND EQUIPMENT - Property, Plant and Equipment by Type (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment $ 13,806 $ 14,103
Additions 1,228 2,343
Capitalized Interest 9 0
Disposals (7) (1,197)
Depreciation (1,562) (1,697)
Impairment reversals (charges) 648 254
Transfers 0 0
Property, plant and equipment 12,826 13,806
Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment 49,784 49,523
Property, plant and equipment 50,984 49,784
Accumulated depreciation and impairments    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment (35,978) (35,420)
Property, plant and equipment (38,158) (35,978)
Buildings, plant and equipment    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment 4,213 4,556
Additions (21) 158
Capitalized Interest 0  
Disposals (7) (72)
Depreciation (790) (878)
Impairment reversals (charges) 394 (102)
Transfers 599 551
Property, plant and equipment 3,600 4,213
Buildings, plant and equipment | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment 14,209 14,111
Property, plant and equipment 14,750 14,209
Buildings, plant and equipment | Accumulated depreciation and impairments    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment (9,996) (9,555)
Property, plant and equipment (11,150) (9,996)
MIning property costs subject to depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment 6,522 7,194
Additions 199 219
Capitalized Interest 0  
Disposals 0 (194)
Depreciation (772) (819)
Impairment reversals (charges) 178 (359)
Transfers 487 481
Property, plant and equipment 6,258 6,522
MIning property costs subject to depreciation | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment 20,938 20,778
Property, plant and equipment 21,624 20,938
MIning property costs subject to depreciation | Accumulated depreciation and impairments    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment (14,416) (13,584)
Property, plant and equipment (15,366) (14,416)
MIning property costs not subject to depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment 3,071 2,353
Additions 1,050 1,966
Capitalized Interest 9  
Disposals 0 (931)
Depreciation 0 0
Impairment reversals (charges) 76 715
Transfers (1,086) (1,032)
Property, plant and equipment 2,968 3,071
MIning property costs not subject to depreciation | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment 14,637 14,634
Property, plant and equipment 14,610 14,637
MIning property costs not subject to depreciation | Accumulated depreciation and impairments    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment (11,566) (12,281)
Property, plant and equipment $ (11,642) $ (11,566)