Provisions and other non-current liabilities - Asset retirement obligation (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Asset Retirement Obligation
Discount rate for valuation of asset retirement obligation (as a percent)	4.00%	3.00%	3.00%
Inflation rate for valuation of asset retirement obligation (as a percent)	2.00%	1.50%	1.50%
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	$ 955
Impact on following year's net income for decrease in discount rate	(76)
Changes in the asset retirement obligation
Balance as of the beginning of the period	14,976	$ 15,368	$ 14,492
Accretion	430	449	607
Revision in estimates	(1,172)	(109)	526
New obligations	198	228	87
Spending on existing obligations	(418)	(527)	(519)
Currency translation adjustment	(663)	(194)	284
Other	(241)	(239)	(109)
Balance as of the end of the period	$ 13,110	$ 14,976	$ 15,368

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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