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Interests in Joint Operations - Summary of Assets Held in Joint Operations (Detail) - USD ($) $ in Millions | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
--- | --- | --- | ---
Disclosure of significant joint operations [Line Items] |  |  |
Current assets | $ 35,130 | $ 21,056 |
Non-current assets | 76,863 | 95,950 | $ 101,239
Total assets | 111,993 | 117,006 | $ 118,953
Joint operations [member] |  |  |
Disclosure of significant joint operations [Line Items] |  |  |
Current assets | 2,445 | 2,755 |
Non-current assets | 36,144 | 51,446 |
Total assets | $ 38,589 | $ 54,201 |

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