Provisions and other non-current liabilities - Asset retirement obligation (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Asset Retirement Obligation
Discount rate for valuation of asset retirement obligation (as a percent)	5.00%	5.00%	4.00%
Inflation rate for valuation of asset retirement obligation (as a percent)	2.00%	2.00%	2.00%
Asset retirement obligations
Asset Retirement Obligation
Potential change in discount rate (as a percent)	0.50%
Increase in asset retirement obligation for decrease in discount rate	$ 877
Impact on following year's net income for decrease in discount rate	(87)
Changes in the asset retirement obligation
Balance as of the beginning of the period	11,585	$ 13,110	$ 14,976
Accretion	568	524	430
Revision in estimates	155	(1,499)	(1,172)
New obligations	200	108	198
Spending on existing obligations	(464)	(339)	(418)
Currency translation adjustment	(249)	101	(663)
Other	(436)	(420)	(241)
Balance as of the end of the period	$ 11,359	$ 11,585	$ 13,110

The increase (decrease) in other provisions resulting from foreign currency exchange rate changes on provisions measured in a currency different from the entity's presentation currency. [Refer: Other provisions]

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The increase in other provisions through adjustments arising from the passage of time. [Refer: Other provisions]

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The increase (decrease) in other provisions resulting from transfers and changes that the entity does not separately disclose in the same statement or note. [Refer: Other provisions]

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The amount recognised for new other provisions. [Refer: Other provisions]

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The amount of non-current provisions other than provisions for employee benefits. [Refer: Non-current provisions]

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The amount used (ie incurred and charged against the provision) for other provisions. [Refer: Other provisions]

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The discount rate used for the valuation of asset retirement obligations.

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The increase (decrease) in the asset retirement obligation that would result from a decrease in the discount rate that was reasonably possible at the end of the reporting period.

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The increase (decrease) in the entity's annual net profit (loss) for future fiscal years that would result from a decrease in the discount rate that was reasonably possible at the end of the reporting period.

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The increase (decrease) in other provisions resulting from revisions in estimates related to existing provisions.

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The inflation rate used for the valuation of asset retirement obligations.

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The reasonably possible percentage of increase or decrease in discount rate used to determine the financial impact in a sensitivity analysis.

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