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Deferred taxation - Recognised and unrecognised amounts in deferred tax assets (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Recognised deferred tax assets $ 4,016 $ 3,624
Unrecognised deferred tax assets 5,978 6,416
France    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Recognised deferred tax assets 0 0
Unrecognised deferred tax assets 1,233 1,320
Canada    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Recognised deferred tax assets 331 383
Unrecognised deferred tax assets 511 501
US    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Recognised deferred tax assets 262 204
Unrecognised deferred tax assets 926 977
Australia    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Recognised deferred tax assets 1,132 991
Unrecognised deferred tax assets 563 842
Mongolia    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Recognised deferred tax assets 1,780 1,530
Unrecognised deferred tax assets 68 235
Other countries    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Recognised deferred tax assets 511 516
Unrecognised deferred tax assets 2,677 2,541
UK    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Accumulated foreign tax credits 1,400 1,300
Tax losses | Mongolia    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Recognised deferred tax assets $ 419 310
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 $ 249 543
Unrecognised deferred tax assets $ 2,561 $ 2,455
Deferred tax loss recovery period 1 year