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Share Capital - Additional Information (Detail) $ / shares in Units, $ in Millions |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 21, 2018 USD ($) | Sep. 20, 2017 USD ($) | Jun. 30, 2018 $ / shares shares | Jun. 30, 2018 £ / shares shares | Jun. 30, 2017 $ / shares | Jun. 30, 2017 £ / shares | Jun. 30, 2016 $ / shares | Jun. 30, 2016 £ / shares | Feb. 23, 2016 $ / shares
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |
Ordinary shares, per cent of total number of shares |  |  | 99.99% | 99.99% |  |  |  |  |
BHP Billiton Limited [Member] |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |
Shares, par value | $ / shares |  |  | $ 0.50 |  |  |  |  |  |
BHP Billiton Plc [Member] |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |
Shares, par value | $ / shares |  |  | $ 0.50 |  |  |  |  |  |
Special Voting share of no par value [Member] | BHP Billiton Limited [Member] |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |
Number of shares issued |  |  | 1 | 1 |  |  |  |  |
Movement in shares |  |  | 0 |  |  |  |  |  |
Special Voting share of par value [Member] | BHP Billiton Plc [Member] |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |
Shares, par value | $ / shares |  |  | $ 0.5 |  | $ 0.5 |  | $ 0.5 |  |
Number of shares issued |  |  | 1 | 1 |  |  |  |  |
Movement in shares |  |  | 0 |  |  |  |  |  |
5.5% Preference shares [Member] |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |
Shares, par value | £ / shares |  |  |  | £ 1 |  | £ 1 |  | £ 1 |
5.5% Preference shares [Member] | BHP Billiton Plc [Member] |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |
Shares, par value | £ / shares |  |  |  | £ 1 |  | £ 1 |  | £ 1 |
Movement in shares |  |  | 0 |  |  |  |  |  |
DLC Dividend share [Member] | BHP Billiton Limited [Member] |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |
Shares, par value | $ / shares |  |  |  |  |  |  |  |  | $ 10
Dividend paid | $ | $ 1,380 | $ 1,280 |  |  |  |  |  |  |

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