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Intangible assets (Tables) | 12 Months Ended
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Jun. 30, 2018
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Summary of Intangible Assets |
|  | 2018 |  |  | 2017 |
|  | Goodwill |  |  | Other intangibles |  |  | Total |  |  | Goodwill |  |  | Other intangibles |  |  | Total |
|  | US$M |  |  | US$M |  |  | US$M |  |  | US$M |  |  | US$M |  |  | US$M |
Net book value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
At the beginning of the financial year |  |  | 3,269 |  |  |  | 699 |  |  |  | 3,968 |  |  |  | 3,273 |  |  |  | 846 |  |  |  | 4,119 |
Additions |  |  | – |  |  |  | 50 |  |  |  | 50 |  |  |  | – |  |  |  | 81 |  |  |  | 81 |
Amortisation for the year |  |  | – |  |  |  | (197 | ) |  |  | (197 | ) |  |  | – |  |  |  | (195 | ) |  |  | (195 | )
Impairments for the year (1) |  |  | (2,339 | ) |  |  | (14 | ) |  |  | (2,353 | ) |  |  | – |  |  |  | (33 | ) |  |  | (33 | )
Disposals |  |  | (16 | ) |  |  | (7 | ) |  |  | (23 | ) |  |  | (4 | ) |  |  | – |  |  |  | (4 | )
Transferred to assets held for sale |  |  | (667 | ) |  |  | – |  |  |  | (667 | ) |  |  | – |  |  |  | – |  |  |  | – |
At the end of the financial year (2) |  |  | 247 |  |  |  | 531 |  |  |  | 778 |  |  |  | 3,269 |  |  |  | 699 |  |  |  | 3,968 |
– Cost |  |  | 247 |  |  |  | 1,665 |  |  |  | 1,912 |  |  |  | 3,269 |  |  |  | 1,722 |  |  |  | 4,991 |
– Accumulated amortisation and impairments |  |  | – |  |  |  | (1,134 | ) |  |  | (1,134 | ) |  |  | – |  |  |  | (1,023 | ) |  |  | (1,023 | )
(1) | Includes impairment charges related to Onshore US assets of US$2,339 million (2017: US$ nil). Refer to note 26 ‘Discontinued operations’.
(2) | The Group’s aggregate net carrying value of goodwill for Continuing operations is US$247 million (2017: US$247 million), representing less than one per cent of net equity at 30 June 2018 (2017: less than one per cent). The goodwill is allocated across a number of cash-generating units (CGUs).

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- Definition The disclosure of the reconciliation of changes in intangible assets and goodwill. [Refer: Intangible assets and goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 118 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118&doctype=Standard -URIDate 2017-03-09 + Details
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