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Dividends - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Aug. 21, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Disclosure of dividends [Line Items] |  |  |  |
Dividend per share, after period-end |  |  | $ 0.43 | $ 0.14
Dividend amount, after period-end |  |  | $ 2,289 | $ 746
Tax rate |  | 30.00% | 30.00% | 30.00%
Major ordinary share transactions [Member] |  |  |  |
Disclosure of dividends [Line Items] |  |  |  |
Dividend per share, after period-end | $ 0.63 |  |  |
Dividend amount, after period-end | $ 3,354 |  |  |
BHP Billiton Limited [Member] |  |  |  |
Disclosure of dividends [Line Items] |  |  |  |
Number of ordinary shares represented by each American Depositary Share |  | 2 |  |
Tax rate |  | 30.00% |  |
BHP Billiton Plc [Member] |  |  |  |
Disclosure of dividends [Line Items] |  |  |  |
Number of ordinary shares represented by each American Depositary Share |  | 2 |  |

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