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Intangible assets - Summary of exploration and evaluation expenditure (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about intangible assets [Line Items]      
Proceeds from disposal of exploration and evaluation assets $ 7 $ 1 $ 10
Net expenditure in the year (net of cash proceeds of US$7 million (2020: US$1 million; 2019: US$10 million) on disposal of undeveloped projects) (852) (711) (671)
Non-cash movements and non-cash proceeds on disposal of undeveloped projects 23 0 0
Amount capitalised during the year 110 87 57
Net charge for the year (719) (624) (614)
Reconciliation to income statement:      
Exploration and evaluation costs (726) (625) (624)
Profit relating to interests in undeveloped projects 7 1 10
Net charge for the year $ (719) $ (624) $ (614)