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Share capital (Tables) | 12 Months Ended
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Jun. 30, 2018
Text block1 [abstract] |
Summary of Share Capital | 14 Share capital
|  | BHP Billiton Limited |  |  | BHP Billiton Plc |
|  | 2018 shares |  |  | 2017 shares |  |  | 2016 shares |  |  | 2018 shares |  |  | 2017 shares |  |  | 2016 shares |
Share capital issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Opening number of shares |  |  | 3,211,691,105 |  |  |  | 3,211,691,105 |  |  |  | 3,211,691,105 |  |  |  | 2,112,071,796 |  |  |  | 2,112,071,796 |  |  |  | 2,112,071,796 |
Purchase of shares by ESOP Trusts |  |  | (7,469,236 | ) |  |  | (6,481,292 | ) |  |  | (6,538,404 | ) |  |  | (679,223 | ) |  |  | (225,646 | ) |  |  | (17,000 | )
Employee share awards exercised following vesting |  |  | 7,339,522 |  |  |  | 6,945,570 |  |  |  | 6,846,091 |  |  |  | 711,705 |  |  |  | 940,070 |  |  |  | 966,473 |
Movement in treasury shares under Employee Share Plans |  |  | 129,714 |  |  |  | (464,278 | ) |  |  | (307,687 | ) |  |  | (32,482 | ) |  |  | (714,424 | ) |  |  | (949,473 | )
Closing number of shares (1) |  |  | 3,211,691,105 |  |  |  | 3,211,691,105 |  |  |  | 3,211,691,105 |  |  |  | 2,112,071,796 |  |  |  | 2,112,071,796 |  |  |  | 2,112,071,796 |
Comprising: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares held by the public |  |  | 3,211,494,259 |  |  |  | 3,211,623,973 |  |  |  | 3,211,159,695 |  |  |  | 2,112,030,162 |  |  |  | 2,111,997,680 |  |  |  | 2,111,283,256 |
Treasury shares |  |  | 196,846 |  |  |  | 67,132 |  |  |  | 531,410 |  |  |  | 41,634 |  |  |  | 74,116 |  |  |  | 788,540 |
Other share classes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Special Voting share of no par value |  |  | 1 |  |  |  | 1 |  |  |  | 1 |  |  |  | – |  |  |  | – |  |  |  | – |
Special Voting share of US$0.50 par value |  |  | – |  |  |  | – |  |  |  | – |  |  |  | 1 |  |  |  | 1 |  |  |  | 1 |
5.5% Preference shares of £1 each |  |  | – |  |  |  | – |  |  |  | – |  |  |  | 50,000 |  |  |  | 50,000 |  |  |  | 50,000 |
DLC Dividend share |  |  | 1 |  |  |  | 1 |  |  |  | 1 |  |  |  | – |  |  |  | – |  |  |  | – |
(1) | No fully paid ordinary shares in BHP Billiton Limited or BHP Billiton Plc were issued on the exercise of Group Incentive Scheme awards during the period 1 July 2018 to 6 September 2018.

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