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Changes in accounting policies - Restatement of deferred tax balances (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Jun. 30, 2023
Other Disclosures [Line Items]    
Deferred tax assets $ 2,796 [1] $ 3,085
Deferred tax liabilities (3,164) [1] $ (3,078)
Deferred tax assets arising from:    
- Provisions and other liabilities 1,586  
- Capital allowances (57)  
Net deferred tax assets 1,529  
Deferred tax liabilities arising from Capital allowances (1,062)  
Opening Balance    
Other Disclosures [Line Items]    
Deferred tax assets 2,766  
Deferred tax liabilities (3,601)  
Impact of IAS 12 amendments    
Other Disclosures [Line Items]    
Deferred tax assets 30  
Deferred tax liabilities 437  
Net impact of IAS 12 amendments on deferred tax balances $ 467  
[1] Comparative information has been restated to reflect the adoption of narrow scope amendments to IAS12 'Income Taxes', refer to note 2 for details.