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Property, plant and equipment - Summary of property, plant and equipment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment at beginning of period $ 58,855 $ 61,057  
Adjustment on currency translation (c) 3,381 353  
Adjustments to capitalised closure costs 710 (123)  
Amounts capitalised 224 111 $ 254
Additions 4,751 3,128  
Depreciation for the year (a) (e) (4,198) (4,567) (4,438)
Impairment charges, net of reversals (f) (435) (248)  
Disposals (123) (258)  
Subsidiaries no longer consolidated (g) (749) (359)  
Transfers and other movements (h) (323) (239)  
Property, plant and equipment at end of period 62,093 58,855 61,057
Non-current assets held under finance leases (i) 37 38  
Non-current assets pledged as security (j) 12,303 11,169  
Cost [member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment at beginning of period 107,837    
Property, plant and equipment at end of period 115,889 107,837  
Accumulated amortisation and impairment [member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment at beginning of period (48,982)    
Property, plant and equipment at end of period (53,796) (48,982)  
Mining properties and leases [member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment at beginning of period 10,848 11,146  
Adjustment on currency translation (c) 495 137  
Adjustments to capitalised closure costs 710 (123)  
Additions 230 237  
Depreciation for the year (a) (e) (673) (760)  
Impairment charges, net of reversals (f) (304) (130)  
Disposals   (3)  
Subsidiaries no longer consolidated (g) (211) (40)  
Transfers and other movements (h) 393 384  
Property, plant and equipment at end of period 11,488 10,848 11,146
Non-current assets pledged as security (j) 3,307 3,310  
Mining properties and leases [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment at beginning of period 22,989    
Property, plant and equipment at end of period 24,691 22,989  
Mining properties and leases [member] | Accumulated amortisation and impairment [member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment at beginning of period (12,141)    
Property, plant and equipment at end of period (13,203) (12,141)  
Land and buildings [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment at beginning of period 7,316 7,571  
Adjustment on currency translation (c) 461 62  
Additions 41 47  
Depreciation for the year (a) (e) (403) (429)  
Impairment charges, net of reversals (f) (2)    
Disposals (57) (169)  
Subsidiaries no longer consolidated (g) (95) (88)  
Transfers and other movements (h) 115 322  
Property, plant and equipment at end of period 7,376 7,316 7,571
Non-current assets pledged as security (j) 410 423  
Land and buildings [Member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment at beginning of period 11,444    
Property, plant and equipment at end of period 12,029 11,444  
Land and buildings [Member] | Accumulated amortisation and impairment [member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment at beginning of period (4,128)    
Property, plant and equipment at end of period (4,653) (4,128)  
Plant and equipment [member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment at beginning of period 35,706 37,900  
Adjustment on currency translation (c) 2,242 138  
Additions 646 537  
Depreciation for the year (a) (e) (3,122) (3,378)  
Impairment charges, net of reversals (f) (128) (112)  
Disposals (40) (86)  
Subsidiaries no longer consolidated (g) (417) (217)  
Transfers and other movements (h) 1,398 924  
Property, plant and equipment at end of period 36,285 35,706 37,900
Non-current assets held under finance leases (i) 37 38  
Non-current assets pledged as security (j) 5,308 5,332  
Plant and equipment [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment at beginning of period 68,030    
Property, plant and equipment at end of period 71,903 68,030  
Plant and equipment [member] | Accumulated amortisation and impairment [member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment at beginning of period (32,324)    
Property, plant and equipment at end of period (35,618) (32,324)  
Capital works in progress [member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment at beginning of period 4,985 4,440  
Adjustment on currency translation (c) 183 16  
Amounts capitalised 224 111  
Additions 3,834 2,307  
Impairment charges, net of reversals (f) (1) (6)  
Disposals (26)    
Subsidiaries no longer consolidated (g) (26) (14)  
Transfers and other movements (h) (2,229) (1,869)  
Property, plant and equipment at end of period 6,944 4,985 $ 4,440
Non-current assets pledged as security (j) 3,278 2,104  
Capital works in progress [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment at beginning of period 5,374    
Property, plant and equipment at end of period 7,266 5,374  
Capital works in progress [member] | Accumulated amortisation and impairment [member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment at beginning of period (389)    
Property, plant and equipment at end of period $ (322) $ (389)