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Intangible assets - Exploration expenditures (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about intangible assets [line items]      
Intangible exploration and evaluation assets $ 1,958 $ 2,261  
Exploration expenditures 1,027 1,371 $ 1,584
Expensed exploration expenditures previously capitalised 171 2,506 777
Capitalised exploration (194) (394) (507)
Exploration expenses 1,004 3,483 $ 1,854
Less than one year [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible exploration and evaluation assets 234 604  
Between one and five years [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible exploration and evaluation assets 692 623  
More than five years [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible exploration and evaluation assets $ 1,033 $ 1,033