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Property, plant and equipment - Narrative (Details)
 6 Months Ended
Jun. 30, 2020
USD ($)
Disclosure of detailed information about property, plant and equipment [line items]  
Right of use Assets $ 3,885,000,000
Gross depreciation of right of use (RoU) assets 598,000,000
Additions to RoU assets 651,000,000
Capitalised expenditures included in intangible assets related to the license $ 962,000,000
Life of license 3 years 6 months
Exploration and development assets [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Gross depreciation of right of use (RoU) assets $ 186,000,000