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Provisions and post-retirement benefits - Summary of Provisions, including post-retirement benefits (footnotes) (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Disclosure of other provisions [Line Items]
Provisions	$ 15,403	$ 15,103
Discount rate on provision	2.00%
Discount rate on provision, percentage of possible change	1.00%
Close down and restoration/ environmental
Disclosure of other provisions [Line Items]
Provisions	$ 11,206	11,090
Increase (decrease) in provision due to reasonably possible decrease in provision discount rate	2,100
Provision capitalised	1,900
Provision expensed	200
Closure related receivables	$ 473	$ 166

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The amount of liabilities of uncertain timing or amount.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 54
-Subparagraph l
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_l&doctype=Standard
-URIDate 2019-03-27

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Closure Related Receivables

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Increase (Decrease) In Provision Capitalised Due To Reasonably Possible Decrease In Provision Discount Rate

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Increase (Decrease) In Provision Due To Reasonably Possible Decrease In Provision Discount Rate

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Increase (Decrease) In Provision Expense Due To Reasonably Possible Decrease In Provision Discount Rate

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Percentage Of Reasonably Possible Decrease In Provision

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