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Changes in accounting policies - Additional information (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Other Disclosures [Line Items]      
Deferred tax liabilities $ 3,078   $ 3,164 [1]
Deferred tax assets 3,085   2,796 [1]
Profit after tax for the period $ 4,947 $ 9,448 [2]  
Impact of IAS 12 amendments      
Other Disclosures [Line Items]      
Deferred tax liabilities     (437)
Deferred tax assets     30
Close-Down And Restoration Obligations, Related Capitalised Closure Costs And Additional Gross Deferred Tax Liabilities | Impact of IAS 12 amendments      
Other Disclosures [Line Items]      
Deferred tax liabilities     922
Deferred tax assets     1,380
Lease Liabilities And Related Right-Of-Use Assets | Impact of IAS 12 amendments      
Other Disclosures [Line Items]      
Deferred tax liabilities     140
Deferred tax assets     $ 149
Depreication Of Closure, Right Of Use Assets, And Settlement Of Closure And Lease Liabilities | Impact of IAS 12 amendments      
Other Disclosures [Line Items]      
Profit after tax for the period   $ 35  
[1] Comparative information has been restated to reflect the adoption of narrow scope amendments to IAS12 'Income Taxes', refer to note 2 for details.
[2] Comparative information has been restated to reflect the adoption of narrow scope amendments to IAS12 'Income Taxes', refer to note 2 for details.