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Provisions and post-retirement benefits - Summary of Provisions, including post-retirement benefits (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Disclosure of other provisions [Line Items] |  |
Opening balance | $ 17,665 |
Adjustment on currency translation | (109) |
Adjustments to mining properties/right of use assets: |  |
– changes in estimate | 24 |
Charged/(credited) to profit: |  |
– increases to existing and new provisions | 502 |
– decreases to existing provisions and unused amounts reversed | (24) |
– exchange losses on provisions | 7 |
– amortisation of discount | 207 |
Utilised in the period | (425) |
Actuarial gains recognised in equity | (616) |
Transfers and other movements | (321) |
Closing balance | 16,910 |
Balance sheet analysis: |  |
Current | 1,834 | $ 1,729
Non-current | 15,076 | 15,936
Total | 16,910 | 17,665
Pensions and post retirement healthcare |  |
Disclosure of other provisions [Line Items] |  |
Opening balance | 3,055 |
Adjustment on currency translation | 41 |
Adjustments to mining properties/right of use assets: |  |
– changes in estimate | 0 |
Charged/(credited) to profit: |  |
– increases to existing and new provisions | 82 |
– decreases to existing provisions and unused amounts reversed | 0 |
– exchange losses on provisions | 0 |
– amortisation of discount | 0 |
Utilised in the period | (76) |
Actuarial gains recognised in equity | (616) |
Transfers and other movements | (291) |
Closing balance | 2,195 |
Balance sheet analysis: |  |
Current | 71 |
Non-current | 2,124 |
Total | 2,195 | 3,055
Other employee entitlements |  |
Disclosure of other provisions [Line Items] |  |
Opening balance | 419 |
Adjustment on currency translation | (10) |
Adjustments to mining properties/right of use assets: |  |
– changes in estimate | 0 |
Charged/(credited) to profit: |  |
– increases to existing and new provisions | 60 |
– decreases to existing provisions and unused amounts reversed | (10) |
– exchange losses on provisions | 0 |
– amortisation of discount | 0 |
Utilised in the period | (63) |
Actuarial gains recognised in equity | 0 |
Transfers and other movements | 0 |
Closing balance | 396 |
Balance sheet analysis: |  |
Current | 306 |
Non-current | 90 |
Total | 396 | 419
Close down and restoration/ environmental |  |
Disclosure of other provisions [Line Items] |  |
Opening balance | 13,335 |
Adjustment on currency translation | (133) |
Adjustments to mining properties/right of use assets: |  |
– changes in estimate | 21 |
Charged/(credited) to profit: |  |
– increases to existing and new provisions | 265 |
– decreases to existing provisions and unused amounts reversed | (2) |
– exchange losses on provisions | 7 |
– amortisation of discount | 206 |
Utilised in the period | (231) |
Actuarial gains recognised in equity | 0 |
Transfers and other movements | (1) |
Closing balance | 13,467 |
Balance sheet analysis: |  |
Current | 917 |
Non-current | 12,550 |
Total | 13,467 | 13,335
Other |  |
Disclosure of other provisions [Line Items] |  |
Opening balance | 856 |
Adjustment on currency translation | (7) |
Adjustments to mining properties/right of use assets: |  |
– changes in estimate | 3 |
Charged/(credited) to profit: |  |
– increases to existing and new provisions | 95 |
– decreases to existing provisions and unused amounts reversed | (12) |
– exchange losses on provisions | 0 |
– amortisation of discount | 1 |
Utilised in the period | (55) |
Actuarial gains recognised in equity | 0 |
Transfers and other movements | (29) |
Closing balance | 852 |
Balance sheet analysis: |  |
Current | 540 |
Non-current | 312 |
Total | $ 852 | $ 856

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- Definition The amount of current provisions. [Refer: Provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph l -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_l&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of expense recognised due to the unwinding of the discount on provisions, resulting from the effect of the passage of time. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in an accounting estimate that has an effect in the current period or is expected to have an effect in future periods. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 8 -IssueDate 2020-01-01 -Paragraph 39 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=8&code=ifrs-tx-2020-en-r&anchor=para_39&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition 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] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2020-01-01 -Paragraph 84 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2020-en-r&anchor=para_84&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition 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] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2020-01-01 -Paragraph 84 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2020-en-r&anchor=para_84&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount used (ie incurred and charged against the provision) for other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2020-01-01 -Paragraph 84 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2020-en-r&anchor=para_84_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount reversed for unused other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2020-01-01 -Paragraph 84 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2020-en-r&anchor=para_84_d&doctype=Standard -URIDate 2020-01-01 + Details
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