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Subsidiaries - Summary of Significant Subsidiaries (Detail) | 12 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
BHP Billiton Mitsui Coal Pty Ltd [member] |  |
Disclosure of significant subsidiaries [Line Items] |  |
Country of incorporation | Australia |
Principal activity | Coal mining |
Group interest | 80.00% | 80.00%
Hunter Valley Energy Coal Pty Ltd [member] |  |
Disclosure of significant subsidiaries [Line Items] |  |
Country of incorporation | Australia |
Principal activity | Coal mining |
Group interest | 100.00% | 100.00%
BHP Billiton Olympic Dam Corporation Pty Ltd [member] |  |
Disclosure of significant subsidiaries [Line Items] |  |
Country of incorporation | Australia |
Principal activity | Copper and uranium mining |
Group interest | 100.00% | 100.00%
Compania Minera Cerro Colorado Limitada [member] |  |
Disclosure of significant subsidiaries [Line Items] |  |
Country of incorporation | Chile |
Principal activity | Copper mining |
Group interest | 100.00% | 100.00%
Minera Escondida Limitada [Member] |  |
Disclosure of significant subsidiaries [Line Items] |  |
Country of incorporation | Chile |
Principal activity | Copper mining |
Group interest | 57.50% | 57.50%
Minera Spence S.A. [member] |  |
Disclosure of significant subsidiaries [Line Items] |  |
Country of incorporation | Chile |
Principal activity | Copper mining |
Group interest | 100.00% | 100.00%
BHP Billiton Iron Ore Pty Ltd [member] |  |
Disclosure of significant subsidiaries [Line Items] |  |
Country of incorporation | Australia |
Principal activity | Service company |
Group interest | 100.00% | 100.00%
BHP Billiton Minerals Pty Ltd [member] |  |
Disclosure of significant subsidiaries [Line Items] |  |
Country of incorporation | Australia |
Principal activity | Iron ore and coal mining |
Group interest | 100.00% | 100.00%
BHP Iron Ore (Jimblebar) Pty Ltd [member] |  |
Disclosure of significant subsidiaries [Line Items] |  |
Country of incorporation | Australia |
Principal activity | Iron ore mining |
Group interest | 85.00% | 85.00%
BHP Billiton (Towage Service) Pty Ltd [member] |  |
Disclosure of significant subsidiaries [Line Items] |  |
Country of incorporation | Australia |
Principal activity | Freight services |
Group interest | 100.00% | 100.00%
BHP Billiton Freight Singapore Pte Limited [member] |  |
Disclosure of significant subsidiaries [Line Items] |  |
Country of incorporation | Singapore |
Principal activity | Freight services |
Group interest | 100.00% | 100.00%
BHP Billiton Marketing AG [member] |  |
Disclosure of significant subsidiaries [Line Items] |  |
Country of incorporation | Switzerland |
Principal activity | Marketing and trading |
Group interest | 100.00% | 100.00%
BHP Billiton Marketing Asia Pte Ltd [member] |  |
Disclosure of significant subsidiaries [Line Items] |  |
Country of incorporation | Singapore |
Principal activity | Marketing support and other services |
Group interest | 100.00% | 100.00%
BHP Billiton Canada Inc. [member] |  |
Disclosure of significant subsidiaries [Line Items] |  |
Country of incorporation | Canada |
Principal activity | Potash development |
Group interest | 100.00% | 100.00%
BHP Billiton Finance BV [member] |  |
Disclosure of significant subsidiaries [Line Items] |  |
Country of incorporation | The Netherlands |
Principal activity | Finance |
Group interest | 100.00% | 100.00%
BHP Billiton Finance Limited [member] |  |
Disclosure of significant subsidiaries [Line Items] |  |
Country of incorporation | Australia |
Principal activity | Finance |
Group interest | 100.00% | 100.00%
BHP Billiton Finance (USA) Ltd [member] |  |
Disclosure of significant subsidiaries [Line Items] |  |
Country of incorporation | Australia |
Principal activity | Finance |
Group interest | 100.00% | 100.00%
BHP Billiton Group Operations Pty Ltd [member] |  |
Disclosure of significant subsidiaries [Line Items] |  |
Country of incorporation | Australia |
Principal activity | Administrative services |
Group interest | 100.00% | 100.00%
BHP Billiton International Services Ltd [member] |  |
Disclosure of significant subsidiaries [Line Items] |  |
Country of incorporation | UK |
Principal activity | Service company |
Group interest | 100.00% | 100.00%
BHP Billiton Nickel West Pty Ltd [member] |  |
Disclosure of significant subsidiaries [Line Items] |  |
Country of incorporation | Australia |
Principal activity | Nickel mining, smelting, refining and administrative services |
Group interest | 100.00% | 100.00%
WMC Finance (USA) Limited [member] |  |
Disclosure of significant subsidiaries [Line Items] |  |
Country of incorporation | Australia |
Principal activity | Finance |
Group interest | 100.00% | 100.00%

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