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Provisions and post-retirement benefits (Tables)
6 Months Ended
Jun. 30, 2020
Disclosure of other provisions [abstract]  
Summary of Provisions including post-retirement benefits
Pensions and post-retirement healthcareOther employee entitlements
Close-down and restoration/ environmental(a)(b)
OtherTotal
For the six months ended 30 June 2020US$mUS$mUS$mUS$mUS$m
Opening balance2,71435411,09094515,103
Adjustment on currency translation(81)(6)(194)(17)(298)
Adjustments to property, plant and equipment:
  – changes in estimate721284
Charged/(credited) to profit:
  – increases to existing and new provisions975227580504
  – decreases to existing provisions and
unused amounts reversed
(6)(94)(68)(168)
  – amortisation of discount2142216
Utilised in the period(97)(26)(155)(73)(351)
Actuarial losses recognised in equity345345
Transfers and other movements(2)(30)(32)
Closing balance2,97836811,20685115,403
Balance sheet analysis:
Current 712826125151,480
Non-current2,9078610,59433613,923
Total2,97836811,20685115,403


(a)Provisions of US$11,206 million (31 December 2019: US$11,090 million) for close-down and restoration costs and environmental clean-up obligations are based on estimates of future cash flows. These estimates have been discounted to their present value at a real discount rate of 2% per annum. If the discount rate was decreased by 1% then the provision would be US$2.1 billion higher, of which approximately US$1.9 billion would be capitalised within 'Property, plant and equipment' and US$0.2 billion would be charged to the income statement.

(b)Close-down and restoration/environmental liabilities at 30 June 2020 have not been adjusted for amounts of US$473 million (31 December 2019: US$166 million) arising from closure related receivables from the co-owners of the Diavik Joint Venture, the ERA trust fund and other financial assets held for the purposes of meeting these obligations.