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Pension and Other Post-retirement Obligations - Summary of Net Liability Recognised in Consolidated Balance Sheet (Detail) - USD ($) $ in Millions | Jun. 30, 2018 | Jun. 30, 2017
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Defined benefit pension schemes/post-employment obligations [member] |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |
Fair value of defined benefit scheme assets | $ (633) | $ (687)
Scheme deficit | 257 | 234
Unrecognised surplus | 0 | 0
Unrecognised past service credits | 0 | 0
Adjustment for employer contributions tax | 0 | 0
Net liability recognised in the Consolidated Balance Sheet | 257 | 234
Defined benefit pension schemes/post-employment obligations [member] | Funded defined benefit obligation [member] |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |
Present value of defined benefit obligation | 616 | 665
Defined benefit pension schemes/post-employment obligations [member] | Unfunded defined benefit obligation [member] |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |
Present value of defined benefit obligation | 274 | 256
Post-retirement medical schemes [member] |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |
Scheme deficit | 192 | 204
Unrecognised surplus | 0 | 0
Unrecognised past service credits | 0 | 0
Adjustment for employer contributions tax | 0 | 0
Net liability recognised in the Consolidated Balance Sheet | 192 | 204
Post-retirement medical schemes [member] | Unfunded defined benefit obligation [member] |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |
Present value of defined benefit obligation | $ 192 | $ 204

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- Definition Defined benefit obligation adjustment for employer contributions tax. + References No definition available. + Details
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- Definition Defined benefit obligation unrecognized past service credits. + References No definition available. + Details
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- Definition Defined benefit obligation unrecognized surplus. + References No definition available. + Details
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- Definition The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of deficit or 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/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_140_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The present value of the defined benefit obligation, less the fair value of the plan assets (if any). [Refer: Plan assets [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Details
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