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Acquisitions and disposals - Acquisitions (Details)
£ in Millions, GW in Millions, $ in Millions
Jun. 28, 2022
GBP (£)
GW
Jun. 28, 2022
USD ($)
May 31, 2022
USD ($)
Spirit Energy's [member]      
Schedule of Business Acquisitions, by Acquisition [Table]      
Cash consideration     $ 193
Cash consideration lifting of volumes     $ 25
Spirit Energy's [member] | Minimum (%) [member]      
Schedule of Business Acquisitions, by Acquisition [Table]      
Percentage of share acquired     11.56%
Spirit Energy's [member] | Maximum (%) [member]      
Schedule of Business Acquisitions, by Acquisition [Table]      
Percentage of share acquired     48.78%
Spirit Energy's [member] | E&P Norway [member]      
Schedule of Business Acquisitions, by Acquisition [Table]      
Cash consideration     $ 96
Property, plant and equipment recognised as of acquisition date     98
Asset Retirement Obligation     390
Deferred tax liabilities     (298)
Increase in taxes payable     98
Spirit Energy's [member] | E&P International [member]      
Schedule of Business Acquisitions, by Acquisition [Table]      
Cash consideration     72
Property, plant and equipment recognised as of acquisition date     98
Asset Retirement Obligation     $ 241
Triton Power [member]      
Schedule of Business Acquisitions, by Acquisition [Table]      
Ownership interest in joint venture 50.00%    
Total purchase price £ 341 $ 413  
Power generation capacity | GW 1.2    
Triton Power [member] | SSE Renewables [member]      
Schedule of Business Acquisitions, by Acquisition [Table]      
Ownership interest in joint venture 50.00%