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Property, plant and equipment - Summary of property, plant and equipment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Disclosure of detailed information about property, plant and equipment [Line Items]        
Property, plant and equipment at beginning of period $ 56,361 $ 62,093    
Adjustment for transition to new accounting standard       $ (31)
Restated opening balance       56,330
Adjustment on currency translation 426 (4,157)    
Adjustments to capitalised closure costs 840 486    
Amounts capitalised 321 296 $ 224  
Additions 5,530 5,301    
Depreciation for the year (3,979) (3,882)    
Impairment charges(b) (3,476) (130)    
Disposals (72) (130)    
Subsidiaries no longer consolidated   (3,386)    
Transfers and other movements 387 (130)    
Property, plant and equipment at end of period 56,307 56,361 62,093  
Finance leases under IAS 17 0 31    
Property, plant and equipment, pledged as security 12,758 13,221    
Cost [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Property, plant and equipment at beginning of period 104,294      
Property, plant and equipment at end of period 112,285 104,294    
Accumulated amortisation and impairment [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Property, plant and equipment at beginning of period (47,933)      
Property, plant and equipment at end of period (55,978) (47,933)    
Mining properties and leases [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Property, plant and equipment at beginning of period 11,063 11,488    
Restated opening balance       11,063
Adjustment on currency translation 27 (689)    
Adjustments to capitalised closure costs 840 486    
Additions 433 403    
Depreciation for the year (729) (664)    
Impairment charges(b) (1,339) (3)    
Disposals 0 (1)    
Subsidiaries no longer consolidated   (1,103)    
Transfers and other movements 107 1,146    
Property, plant and equipment at end of period 10,402 11,063 11,488  
Property, plant and equipment, pledged as security 1,805 3,054    
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 23,318      
Property, plant and equipment at end of period 24,875 23,318    
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 (12,255)      
Property, plant and equipment at end of period (14,473) (12,255)    
Land and buildings [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Property, plant and equipment at beginning of period 6,263 7,376    
Restated opening balance       6,263
Adjustment on currency translation 72 (548)    
Additions 46 80    
Depreciation for the year (381) (382)    
Impairment charges(b) (96) (20)    
Disposals (9) (54)    
Subsidiaries no longer consolidated   (377)    
Transfers and other movements 508 188    
Property, plant and equipment at end of period 6,403 6,263 7,376  
Property, plant and equipment, pledged as security 571 385    
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 10,601      
Property, plant and equipment at end of period 11,517 10,601    
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 (4,338)      
Property, plant and equipment at end of period (5,114) (4,338)    
Plant and equipment [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Property, plant and equipment at beginning of period 32,019 36,285    
Adjustment for transition to new accounting standard       (31)
Restated opening balance       31,988
Adjustment on currency translation 286 (2,671)    
Additions 616 459    
Depreciation for the year (2,869) (2,836)    
Impairment charges(b) (1,115) (101)    
Disposals (44) (71)    
Subsidiaries no longer consolidated   (1,392)    
Transfers and other movements 2,629 2,346    
Property, plant and equipment at end of period 31,491 32,019 36,285  
Finance leases under IAS 17   31    
Property, plant and equipment, pledged as security 5,111 5,194    
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 63,051      
Property, plant and equipment at end of period 66,705 63,051    
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 (31,032)      
Property, plant and equipment at end of period (35,214) (31,032)    
Capital works in progress [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Property, plant and equipment at beginning of period 7,016 6,944    
Restated opening balance       $ 7,016
Adjustment on currency translation 41 (249)    
Amounts capitalised 321 296    
Additions 4,435 4,359    
Depreciation for the year 0      
Impairment charges(b) (926) (6)    
Disposals (19) (4)    
Subsidiaries no longer consolidated   (514)    
Transfers and other movements (2,857) (3,810)    
Property, plant and equipment at end of period 8,011 7,016 $ 6,944  
Property, plant and equipment, pledged as security 5,271 4,588    
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 7,324      
Property, plant and equipment at end of period 9,188 7,324    
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 (308)      
Property, plant and equipment at end of period $ (1,177) $ (308)