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Intangible Assets - Summary of Intangible Assets (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |  |
Impairment charges related to Onshore US | $ 2,353 | $ 33 |
Continuing operations [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |  |
Impairment charges related to Onshore US | 14 | 33 | $ 16
Net carrying value of goodwill | $ 247 | $ 247 |
Net carrying value of goodwill, per cent of net equity | 1.00% | 1.00% |
Impairment of Onshore US assets [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |  |
Impairment charges related to Onshore US | $ 2,339 |  |

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