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Interests in Joint Operations - Summary of Assets Held in Joint Operations (Parenthetical) (Detail) - USD ($) $ in Millions | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
--- | --- | --- | ---
Disclosure of significant joint operations [Line Items] |  |  |
Assets | $ 111,993 | $ 117,006 | $ 118,953
Discontinued Operations - Onshore US Cash Generating Units [Member] |  |  |
Disclosure of significant joint operations [Line Items] |  |  |
Assets |  | $ 14,408 |

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