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Share Capital - Summary of Share Capital (Detail) - shares | 12 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
5.5% Preference shares [Member] |  |  |
Share capital issued |  |  |
Opening number of shares | 50,000 | 50,000 |
Closing number of shares | 50,000 | 50,000 | 50,000
BHP Billiton Limited [Member] |  |  |
Share capital issued |  |  |
Opening number of shares | 3,211,691,105 | 3,211,691,105 | 3,211,691,105
Purchase of shares by ESOP Trusts | (7,469,236) | (6,481,292) | (6,538,404)
Employee share awards exercised following vesting | 7,339,522 | 6,945,570 | 6,846,091
Movement in treasury shares under Employee Share Plans | 129,714 | (464,278) | (307,687)
Closing number of shares | 3,211,691,105 | 3,211,691,105 | 3,211,691,105
BHP Billiton Limited [Member] | Shares held by the public [member] |  |  |
Share capital issued |  |  |
Opening number of shares | 3,211,623,973 | 3,211,159,695 |
Closing number of shares | 3,211,494,259 | 3,211,623,973 | 3,211,159,695
BHP Billiton Limited [Member] | Treasury shares [member] |  |  |
Share capital issued |  |  |
Opening number of shares | 67,132 | 531,410 |
Closing number of shares | 196,846 | 67,132 | 531,410
BHP Billiton Limited [Member] | Special Voting share of no par value [Member] |  |  |
Share capital issued |  |  |
Opening number of shares | 1 | 1 |
Closing number of shares | 1 | 1 | 1
BHP Billiton Limited [Member] | DLC Dividend share [Member] |  |  |
Share capital issued |  |  |
Opening number of shares | 1 | 1 |
Closing number of shares | 1 | 1 | 1
BHP Billiton Plc [Member] |  |  |
Share capital issued |  |  |
Opening number of shares | 2,112,071,796 | 2,112,071,796 | 2,112,071,796
Purchase of shares by ESOP Trusts | (679,223) | (225,646) | (17,000)
Employee share awards exercised following vesting | 711,705 | 940,070 | 966,473
Movement in treasury shares under Employee Share Plans | (32,482) | (714,424) | (949,473)
Closing number of shares | 2,112,071,796 | 2,112,071,796 | 2,112,071,796
BHP Billiton Plc [Member] | Shares held by the public [member] |  |  |
Share capital issued |  |  |
Opening number of shares | 2,111,997,680 | 2,111,283,256 |
Closing number of shares | 2,112,030,162 | 2,111,997,680 | 2,111,283,256
BHP Billiton Plc [Member] | Treasury shares [member] |  |  |
Share capital issued |  |  |
Opening number of shares | 74,116 | 788,540 |
Closing number of shares | 41,634 | 74,116 | 788,540
BHP Billiton Plc [Member] | Special Voting share of par value [Member] |  |  |
Share capital issued |  |  |
Opening number of shares | 1 | 1 |
Closing number of shares | 1 | 1 | 1
BHP Billiton Plc [Member] | 5.5% Preference shares [Member] |  |  |
Share capital issued |  |  |
Opening number of shares | 50,000 | 50,000 |
Closing number of shares | 50,000 | 50,000 | 50,000

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