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Deferred taxation - Recognised and unrecognised amounts in deferred tax assets (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Recognised deferred tax assets $ 3,624 $ 2,796 [1]
Unrecognised deferred tax assets 6,416 5,293
France    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Recognised deferred tax assets 0 0
Unrecognised deferred tax assets 1,320 1,204
Canada    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Recognised deferred tax assets 383 482
Unrecognised deferred tax assets 501 580
US    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Recognised deferred tax assets 204 137
Unrecognised deferred tax assets 977 960
Australia    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Recognised deferred tax assets 991 700
Unrecognised deferred tax assets 842 585
Mongolia    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Recognised deferred tax assets 1,530 1,218
Unrecognised deferred tax assets 235 257
Other countries    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Recognised deferred tax assets 516 259
Unrecognised deferred tax assets 2,541 1,707
UK    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Accumulated foreign tax credits 1,300 1,300
Tax losses | Mongolia    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Recognised deferred tax assets $ 310 73
Deferred tax loss recovery period 8 years  
Realised or unrealised capital losses    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Recognised deferred tax assets $ 543 473
Unrecognised deferred tax assets $ 2,455 $ 1,490
Deferred tax loss recovery period 1 year  
[1] Comparative information has been restated to reflect the adoption of narrow-scope amendments to IAS 12. Refer to page 166 for details.