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About the presentation of our financial statements - Restatement of deferred tax balances (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Other Disclosures [Line Items]      
Deferred tax assets $ 3,624 $ 2,796 [1]  
Deferred tax liabilities (2,584) (3,164) [1]  
Deferred tax liability (asset) (1,040) 368 $ (395)
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 252 (1,062)  
Profit after tax for the year $ 9,953 [2] 13,048 [3],[4] 22,597 [2],[3]
Opening balance as previously reported      
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  
Deferred tax liability (asset)   467  
Impact of IAS 12 amendments | Close-Down And Restoration Obligations, Related Capitalised Closure Costs And Additional Gross Deferred Tax Liabilities      
Other Disclosures [Line Items]      
Deferred tax assets   1,380  
Deferred tax liabilities   (922)  
Impact of IAS 12 amendments | Lease Liabilities And Related Right-Of-Use Assets      
Other Disclosures [Line Items]      
Deferred tax assets   149  
Deferred tax liabilities   (140)  
Impact of IAS 12 amendments | Depreication Of Closure, Right Of Use Assets, And Settlement Of Closure And Lease Liabilities      
Deferred tax assets arising from:      
Profit after tax for the year   $ 28 $ 22
[1] Comparative information has been restated to reflect the adoption of narrow-scope amendments to IAS 12. Refer to page 166 for details.
[2] Comparative information has been restated to reflect the adoption of narrow-scope amendments to IAS 12. Refer to page 166 for details.
[3] Comparative information has been restated to reflect the adoption of narrow-scope amendments to IAS 12. Refer to page 166 for details.
[4] Comparative information has been restated to reflect the adoption of narrow-scope amendments to IAS 12. Refer to page 166 for details.