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Property, plant and equipment and intangible assets (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2020
USD ($)
Property, plant and equipment and intangible assets [abstract]  
Balance, beginning $ 69,953
Additions 4,929
Transfers 44
Disposals and reclassifications (16)
Expensed exploration expenditures and impairment losses 0
Depreciation, amortisation and net impairment losses (6,946)
Effect of foreign currency translation adjustments (4,022)
Balance, ending 63,941
Intangible Assets [Abstract]  
Intangibles beginning 10,738
Additions 421
Transfers (44)
Disposals and reclassifications (4)
Expensed exploration expenditures and impairment losses (560)
Amortisation and net impairment losses (13)
Effect of foreign currency translation adjustments (221)
Intangibles ending $ 10,317