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Property, plant and equipment and intangible assets (Details)
$ in Millions
6 Months Ended
Jun. 30, 2021
USD ($)
Property, plant and equipment and intangible assets [abstract]  
Balance, beginning $ 65,672
Additions through business combinations 4
Additions 3,429
Transfers 1,467
Disposals and reclassifications 45
Transferred to assets classified as held for sale (281)
Depreciation, amortisation and net impairment losses (4,890)
Effect of foreign currency translation adjustments (73)
Balance, ending 65,373
Intangible Assets [Abstract]  
Intangibles beginning 8,148
Additions through business combinations 106
Additions 166
Transfers (1,467)
Disposals and reclassifications (12)
Transferred to assets classified as held for sale 0
Expensed exploration expenditures and impairment losses (89)
Depreciation, amortisation and net impairment losses (18)
Effect of foreign currency translation adjustments (5)
Intangibles ending $ 6,829