Climate change and energy transition - Carbon price per region (Details) - $ / Tonne	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
2024-2033 \| European Union \| Bottom of range
Disclosure of Climate Change and Energy Transition [Line Items]
Carbon cost forecast (per tonne)	87
2024-2033 \| European Union \| Top of range
Disclosure of Climate Change and Energy Transition [Line Items]
Carbon cost forecast (per tonne)	132
2024-2033 \| Norway \| Bottom of range
Disclosure of Climate Change and Energy Transition [Line Items]
Carbon cost forecast (per tonne)	97
2024-2033 \| Norway \| Top of range
Disclosure of Climate Change and Energy Transition [Line Items]
Carbon cost forecast (per tonne)	226
2024-2033 \| United Kingdom \| Bottom of range
Disclosure of Climate Change and Energy Transition [Line Items]
Carbon cost forecast (per tonne)	94
2024-2033 \| United Kingdom \| Top of range
Disclosure of Climate Change and Energy Transition [Line Items]
Carbon cost forecast (per tonne)	145
2024-2033 \| Canada (Federal) \| Bottom of range
Disclosure of Climate Change and Energy Transition [Line Items]
Carbon cost forecast (per tonne)	59
2024-2033 \| Canada (Federal) \| Top of range
Disclosure of Climate Change and Energy Transition [Line Items]
Carbon cost forecast (per tonne)	113
2024-2033 \| United States of America (Federal) \| Bottom of range
Disclosure of Climate Change and Energy Transition [Line Items]
Carbon cost forecast (per tonne)	0
2024-2033 \| United States of America (Federal) \| Top of range
Disclosure of Climate Change and Energy Transition [Line Items]
Carbon cost forecast (per tonne)	42
2024-2033 \| Australia \| Bottom of range
Disclosure of Climate Change and Energy Transition [Line Items]
Carbon cost forecast (per tonne)	29
2024-2033 \| Australia \| Top of range
Disclosure of Climate Change and Energy Transition [Line Items]
Carbon cost forecast (per tonne)	61
2024-2033 \| All other countries \| Bottom of range
Disclosure of Climate Change and Energy Transition [Line Items]
Carbon cost forecast (per tonne)	0
2024-2033 \| All other countries \| Top of range
Disclosure of Climate Change and Energy Transition [Line Items]
Carbon cost forecast (per tonne)	55
2024-2033 \| The Netherlands \| Bottom of range
Disclosure of Climate Change and Energy Transition [Line Items]
Carbon cost forecast (per tonne)	87
2024-2033 \| The Netherlands \| Top of range
Disclosure of Climate Change and Energy Transition [Line Items]
Carbon cost forecast (per tonne)	(159)
2034-2050 \| European Union \| Bottom of range
Disclosure of Climate Change and Energy Transition [Line Items]
Carbon cost forecast (per tonne)	134
2034-2050 \| European Union \| Top of range
Disclosure of Climate Change and Energy Transition [Line Items]
Carbon cost forecast (per tonne)	170
2034-2050 \| Norway \| Bottom of range
Disclosure of Climate Change and Energy Transition [Line Items]
Carbon cost forecast (per tonne)		226
2034-2050 \| Norway \| Top of range
Disclosure of Climate Change and Energy Transition [Line Items]
Carbon cost forecast (per tonne)		226
2034-2050 \| United Kingdom \| Bottom of range
Disclosure of Climate Change and Energy Transition [Line Items]
Carbon cost forecast (per tonne)		146
2034-2050 \| United Kingdom \| Top of range
Disclosure of Climate Change and Energy Transition [Line Items]
Carbon cost forecast (per tonne)		170
2034-2050 \| Canada (Federal) \| Bottom of range
Disclosure of Climate Change and Energy Transition [Line Items]
Carbon cost forecast (per tonne)	113
2034-2050 \| Canada (Federal) \| Top of range
Disclosure of Climate Change and Energy Transition [Line Items]
Carbon cost forecast (per tonne)	125
2034-2050 \| United States of America (Federal) \| Bottom of range
Disclosure of Climate Change and Energy Transition [Line Items]
Carbon cost forecast (per tonne)	47
2034-2050 \| United States of America (Federal) \| Top of range
Disclosure of Climate Change and Energy Transition [Line Items]
Carbon cost forecast (per tonne)	125
2034-2050 \| Australia \| Bottom of range
Disclosure of Climate Change and Energy Transition [Line Items]
Carbon cost forecast (per tonne)	65
2034-2050 \| Australia \| Top of range
Disclosure of Climate Change and Energy Transition [Line Items]
Carbon cost forecast (per tonne)	125
2034-2050 \| All other countries \| Bottom of range
Disclosure of Climate Change and Energy Transition [Line Items]
Carbon cost forecast (per tonne)	25
2034-2050 \| All other countries \| Top of range
Disclosure of Climate Change and Energy Transition [Line Items]
Carbon cost forecast (per tonne)	125
2034-2050 \| The Netherlands \| Bottom of range
Disclosure of Climate Change and Energy Transition [Line Items]
Carbon cost forecast (per tonne)	163
2034-2050 \| The Netherlands \| Top of range
Disclosure of Climate Change and Energy Transition [Line Items]
Carbon cost forecast (per tonne)	220