Climate change and energy transition - Additional Information 2 (Details) $ in Millions	12 Months Ended		108 Months Ended
	Dec. 31, 2025 USD ($) outlook	Dec. 31, 2024 USD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Disclosure of Climate Change and Energy Transition [Line Items]
Property, plant and equipment	$ 185,077	$ 185,219	$ 185,077
Priceline 1
Disclosure of Climate Change and Energy Transition [Line Items]
Number of external price outlooks \| outlook	3
Minimum
Disclosure of Climate Change and Energy Transition [Line Items]
Impairment sensitivity to mid-price outlook	(10.00%)
Maximum
Disclosure of Climate Change and Energy Transition [Line Items]
Impairment sensitivity to mid-price outlook	10.00%
2030
Disclosure of Climate Change and Energy Transition [Line Items]
Proportion of SEC proved reserve	55.00%
2040
Disclosure of Climate Change and Energy Transition [Line Items]
Proportion of SEC proved reserve	8.00%
2050
Disclosure of Climate Change and Energy Transition [Line Items]
Proportion of SEC proved reserve	1.00%
Integrated Gas and Upstream segments
Disclosure of Climate Change and Energy Transition [Line Items]
Disposals of property, plant and equipment			31,000
Integrated Gas and Upstream segments \| Minimum
Disclosure of Climate Change and Energy Transition [Line Items]
Sensitivity - 10% to the mid-price outlook	$ 7,000	5,000	7,000
Expected reversal of impairment loss with change in measurement input	2,000	2,000
Integrated Gas and Upstream segments \| Maximum
Disclosure of Climate Change and Energy Transition [Line Items]
Sensitivity - 10% to the mid-price outlook	10,000	9,000	10,000
Expected reversal of impairment loss with change in measurement input	5,000	5,000
Production assets
Disclosure of Climate Change and Energy Transition [Line Items]
Property, plant and equipment	101,000	102,000	101,000	$ 111,000	$ 117,000	$ 118,000	$ 132,000	$ 150,000	$ 149,000	$ 154,000	$ 169,000
Production assets \| Integrated Gas and Upstream segments
Disclosure of Climate Change and Energy Transition [Line Items]
Property, plant and equipment	101,000		101,000								169,000
Exploration and evaluation assets [member]
Disclosure of Climate Change and Energy Transition [Line Items]
Property, plant and equipment	$ 3,980	$ 4,108	$ 3,980	$ 5,000	$ 6,000	$ 7,000	$ 9,000	$ 15,000	$ 18,000	$ 19,000	$ 19,000