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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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- Definition The amount of liabilities of uncertain timing or amount. + References 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 + Details
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- Details
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