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Provisions and post-retirement benefits - Summary of Provisions, including post-retirement benefits (footnotes) (Detail) € in Millions, $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2021 EUR (€) | Dec. 31, 2020 USD ($)
Disclosure of other provisions [Line Items] |  |  |
Employee benefits pre-tax charge | $ 3 |  |
Other employee entitlements |  |  |
Disclosure of other provisions [Line Items] |  |  |
Provision for long service leave | 275 |  | $ 283
Provisions for redundancy and severance payments | 52 |  | 62
Close down and restoration/ environmental |  |  |
Disclosure of other provisions [Line Items] |  |  |
Closure related receivables | 595 |  | $ 574
Wholly or partly funded defined benefit plans |  |  |
Disclosure of other provisions [Line Items] |  |  |
Present value of pension assets | 89 |  |
Cash payment to execute buyout of partially funded pension scheme | $ 294 | € 247 |

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- Definition The amount of surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Employee Benefits Pre-Tax Charge + References No definition available. + Details
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- Definition Provision For Long Service Leave + References No definition available. + Details
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- Definition Provisions For Redundancy And Severance Payments + References No definition available. + Details
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- Details
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