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Non-current assets held for sale - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Assets and liabilities held for sale [Line Items]      
Non-current assets or disposal groups classified as held for sale or as held for distribution to owners $ 4,081 $ 151  
Liabilities included in disposal groups classified as held for sale 1,105 62  
Currency translation differences (including reclassifications)a (364) 754 $ 6,853
Reserve of exchange differences on translation [member]      
Assets and liabilities held for sale [Line Items]      
Currency translation differences (including reclassifications)a (276) 728 $ 6,914
gas & low carbon energy | Lightsource bp      
Assets and liabilities held for sale [Line Items]      
Non-current assets or disposal groups classified as held for sale or as held for distribution to owners 1,702    
Liabilities included in disposal groups classified as held for sale 1,050    
gas & low carbon energy | UK, Japan, Germany and US development projects [Member]      
Assets and liabilities held for sale [Line Items]      
Non-current assets or disposal groups classified as held for sale or as held for distribution to owners 1,793    
Liabilities included in disposal groups classified as held for sale 14    
gas & low carbon energy | bp Wind Energy      
Assets and liabilities held for sale [Line Items]      
Non-current assets or disposal groups classified as held for sale or as held for distribution to owners 569    
Liabilities included in disposal groups classified as held for sale $ 41    
gas & low carbon energy | Arcius Energy [Member]      
Assets and liabilities held for sale [Line Items]      
Proportion of ownership interest in joint venture 51.00%    
customers & products | Petrol Ofisi [Member]      
Assets and liabilities held for sale [Line Items]      
Non-current assets or disposal groups classified as held for sale or as held for distribution to owners   151  
Liabilities included in disposal groups classified as held for sale   $ 62  
Gains (losses) on sale of businesses $ 1,132    
customers & products | Petrol Ofisi [Member] | Reserve of exchange differences on translation [member]      
Assets and liabilities held for sale [Line Items]      
Currency translation differences (including reclassifications)a 942    
oil production & operations      
Assets and liabilities held for sale [Line Items]      
Gain (loss) recognised on measurement to fair value less costs to sell or on disposal of assets or disposal groups constituting discontinued operation $ 890