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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, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Disclosure of other provisions [Line Items] |  |  |
Opening balance | $ 15,103 |  |
Adjustment on currency translation | (298) |  |
Adjustments to property, plant and equipment: |  |  |
– changes in estimate | 84 |  |
Charged/(credited) to profit: |  |  |
– increases to existing and new provisions | 504 |  |
– decreases to existing provisions and unused amounts reversed | (168) |  |
– amortisation of discount | 216 |  |
Utilised in the period | (351) |  |
Actuarial losses recognised in equity | 345 |  |
Transfers and other movements | (32) |  |
Closing balance | 15,403 |  |
Balance sheet analysis: |  |  |
Current |  | $ 1,480 | $ 1,399
Non-current |  | 13,923 | 13,704
Total | 15,403 | 15,403 | 15,103
Pensions and post retirement healthcare |  |  |
Disclosure of other provisions [Line Items] |  |  |
Opening balance | 2,714 |  |
Adjustment on currency translation | (81) |  |
Adjustments to property, plant and equipment: |  |  |
– changes in estimate | 0 |  |
Charged/(credited) to profit: |  |  |
– increases to existing and new provisions | 97 |  |
– decreases to existing provisions and unused amounts reversed | 0 |  |
– amortisation of discount | 0 |  |
Utilised in the period | (97) |  |
Actuarial losses recognised in equity | 345 |  |
Transfers and other movements | 0 |  |
Closing balance | 2,978 |  |
Balance sheet analysis: |  |  |
Current |  | 71 |
Non-current |  | 2,907 |
Total | 2,978 | 2,978 | 2,714
Other employee entitlements |  |  |
Disclosure of other provisions [Line Items] |  |  |
Opening balance | 354 |  |
Adjustment on currency translation | (6) |  |
Adjustments to property, plant and equipment: |  |  |
– changes in estimate | 0 |  |
Charged/(credited) to profit: |  |  |
– increases to existing and new provisions | 52 |  |
– decreases to existing provisions and unused amounts reversed | (6) |  |
– amortisation of discount | 0 |  |
Utilised in the period | (26) |  |
Actuarial losses recognised in equity | 0 |  |
Transfers and other movements | 0 |  |
Closing balance | 368 |  |
Balance sheet analysis: |  |  |
Current |  | 282 |
Non-current |  | 86 |
Total | 368 | 368 | 354
Close down and restoration/ environmental |  |  |
Disclosure of other provisions [Line Items] |  |  |
Opening balance | 11,090 |  |
Adjustment on currency translation | (194) |  |
Adjustments to property, plant and equipment: |  |  |
– changes in estimate | 72 |  |
Charged/(credited) to profit: |  |  |
– increases to existing and new provisions | 275 |  |
– decreases to existing provisions and unused amounts reversed | (94) |  |
– amortisation of discount | 214 |  |
Utilised in the period | (155) |  |
Actuarial losses recognised in equity | 0 |  |
Transfers and other movements | (2) |  |
Closing balance | 11,206 |  |
Balance sheet analysis: |  |  |
Current |  | 612 |
Non-current |  | 10,594 |
Total | 11,090 | 11,206 | 11,090
Other |  |  |
Disclosure of other provisions [Line Items] |  |  |
Opening balance | 945 |  |
Adjustment on currency translation | (17) |  |
Adjustments to property, plant and equipment: |  |  |
– changes in estimate | 12 |  |
Charged/(credited) to profit: |  |  |
– increases to existing and new provisions | 80 |  |
– decreases to existing provisions and unused amounts reversed | (68) |  |
– amortisation of discount | 2 |  |
Utilised in the period | (73) |  |
Actuarial losses recognised in equity | 0 |  |
Transfers and other movements | (30) |  |
Closing balance | 851 |  |
Balance sheet analysis: |  |  |
Current |  | 515 |
Non-current |  | 336 |
Total | $ 851 | $ 851 | $ 945

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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 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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- 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 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 84 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2019-en-r&anchor=para_84&doctype=Standard -URIDate 2019-03-27 + Details
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