v3.25.2
Taxation - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Income Taxes [Line Items]      
Relating to changes in tax rates and legislation $ 112 $ 242 $ 785
Deferred tax asset 6,857 6,454  
Deferred tax assets dependent on future taxable profits 4,022 2,027  
Unrecognised taxable temporary differences associated with undistributed retained earnings of investments in subsidiaries, joint ventures and associates 4,504 5,311  
Unrecognised deductible temporary differences, unused tax losses and credits carried forward 27,568 28,460  
Unrecognised deductible temporary differences, unused tax losses and credits carried forward that are subject to time limits for utilisation of five years or later or are not time limited 25,875 25,489  
Brazil, Malaysia and Australia      
Disclosure Of Income Taxes [Line Items]      
Deferred tax asset 625 241  
Chemical & products and Marketing      
Disclosure Of Income Taxes [Line Items]      
Deferred tax asset $ 315 $ 455  
UK Energy Profits Levy Act 2022 (EPL)      
Disclosure Of Income Taxes [Line Items]      
Relating to changes in tax rates and legislation     $ 524