v3.25.4
Climate change and energy transition - Carbon price per region (Details)
 12 Months Ended
Dec. 31, 2025
$ / Tonne
$ / t
Dec. 31, 2024
$ / Tonne
2026-2035 | European Union | Bottom of range    
Disclosure of Climate Change and Energy Transition [Line Items]    
Carbon cost forecast (per tonne) 100  
2026-2035 | European Union | Top of range    
Disclosure of Climate Change and Energy Transition [Line Items]    
Carbon cost forecast (per tonne) 140  
2026-2035 | Norway | Bottom of range    
Disclosure of Climate Change and Energy Transition [Line Items]    
Carbon cost forecast (per tonne) 183  
2026-2035 | Norway | Top of range    
Disclosure of Climate Change and Energy Transition [Line Items]    
Carbon cost forecast (per tonne) 226  
2026-2035 | United Kingdom | Bottom of range    
Disclosure of Climate Change and Energy Transition [Line Items]    
Carbon cost forecast (per tonne) 78  
2026-2035 | United Kingdom | Top of range    
Disclosure of Climate Change and Energy Transition [Line Items]    
Carbon cost forecast (per tonne) 140  
2026-2035 | Canada (Federal) | Bottom of range    
Disclosure of Climate Change and Energy Transition [Line Items]    
Carbon cost forecast (per tonne) 79  
2026-2035 | Canada (Federal) | Top of range    
Disclosure of Climate Change and Energy Transition [Line Items]    
Carbon cost forecast (per tonne) 116  
2026-2035 | United States of America (Federal) | Bottom of range    
Disclosure of Climate Change and Energy Transition [Line Items]    
Carbon cost forecast (per tonne) 0  
2026-2035 | United States of America (Federal) | Top of range    
Disclosure of Climate Change and Energy Transition [Line Items]    
Carbon cost forecast (per tonne) 35  
2026-2035 | Australia | Bottom of range    
Disclosure of Climate Change and Energy Transition [Line Items]    
Carbon cost forecast (per tonne) 32  
2026-2035 | Australia | Top of range    
Disclosure of Climate Change and Energy Transition [Line Items]    
Carbon cost forecast (per tonne) 75  
2026-2035 | All other countries | Bottom of range    
Disclosure of Climate Change and Energy Transition [Line Items]    
Carbon cost forecast (per tonne) 0  
2026-2035 | All other countries | Top of range    
Disclosure of Climate Change and Energy Transition [Line Items]    
Carbon cost forecast (per tonne) 71  
2026-2035 | The Netherlands | Bottom of range    
Disclosure of Climate Change and Energy Transition [Line Items]    
Carbon cost forecast (per tonne) | $ / t 110  
2026-2035 | The Netherlands | Top of range    
Disclosure of Climate Change and Energy Transition [Line Items]    
Carbon cost forecast (per tonne) | $ / t 170  
2036-2050 | European Union | Bottom of range    
Disclosure of Climate Change and Energy Transition [Line Items]    
Carbon cost forecast (per tonne) 143  
2036-2050 | European Union | Top of range    
Disclosure of Climate Change and Energy Transition [Line Items]    
Carbon cost forecast (per tonne) 185  
2036-2050 | Norway | Bottom of range    
Disclosure of Climate Change and Energy Transition [Line Items]    
Carbon cost forecast (per tonne)   226
2036-2050 | Norway | Top of range    
Disclosure of Climate Change and Energy Transition [Line Items]    
Carbon cost forecast (per tonne)   230
2036-2050 | United Kingdom | Bottom of range    
Disclosure of Climate Change and Energy Transition [Line Items]    
Carbon cost forecast (per tonne)   143
2036-2050 | United Kingdom | Top of range    
Disclosure of Climate Change and Energy Transition [Line Items]    
Carbon cost forecast (per tonne)   185
2036-2050 | Canada (Federal) | Bottom of range    
Disclosure of Climate Change and Energy Transition [Line Items]    
Carbon cost forecast (per tonne) 116  
2036-2050 | Canada (Federal) | Top of range    
Disclosure of Climate Change and Energy Transition [Line Items]    
Carbon cost forecast (per tonne) 125  
2036-2050 | United States of America (Federal) | Bottom of range    
Disclosure of Climate Change and Energy Transition [Line Items]    
Carbon cost forecast (per tonne) 41  
2036-2050 | United States of America (Federal) | Top of range    
Disclosure of Climate Change and Energy Transition [Line Items]    
Carbon cost forecast (per tonne) 125  
2036-2050 | Australia | Bottom of range    
Disclosure of Climate Change and Energy Transition [Line Items]    
Carbon cost forecast (per tonne) 80  
2036-2050 | Australia | Top of range    
Disclosure of Climate Change and Energy Transition [Line Items]    
Carbon cost forecast (per tonne) 150  
2036-2050 | All other countries | Bottom of range    
Disclosure of Climate Change and Energy Transition [Line Items]    
Carbon cost forecast (per tonne) 15  
2036-2050 | All other countries | Top of range    
Disclosure of Climate Change and Energy Transition [Line Items]    
Carbon cost forecast (per tonne) 150  
2036-2050 | The Netherlands | Bottom of range    
Disclosure of Climate Change and Energy Transition [Line Items]    
Carbon cost forecast (per tonne) | $ / t 171  
2036-2050 | The Netherlands | Top of range    
Disclosure of Climate Change and Energy Transition [Line Items]    
Carbon cost forecast (per tonne) | $ / t 185