v3.26.1
Subsidiaries - Summary of Significant Subsidiaries (Detail)
12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Hunter Valley Energy Coal Pty Ltd [member]    
Disclosure of significant subsidiaries [line items]    
Country of incorporation Australia  
Principal activity Coal mining  
Group's interest 100.00% 100.00%
BHP Olympic Dam Corporation Pty Ltd [member]    
Disclosure of significant subsidiaries [line items]    
Country of incorporation Australia  
Principal activity Copper, uranium and gold mining  
Group's 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's interest 100.00% 100.00%
Minera Escondida Ltda [member]    
Disclosure of significant subsidiaries [line items]    
Country of incorporation [1] Chile  
Principal activity [1] Copper mining  
Group's interest [1] 57.50% 57.50%
Minera Spence SA [member]    
Disclosure of significant subsidiaries [line items]    
Country of incorporation Chile  
Principal activity Copper mining  
Group's interest 100.00% 100.00%
OZ Minerals Carrapateena Pty Ltd [member]    
Disclosure of significant subsidiaries [line items]    
Country of incorporation Australia  
Principal activity Copper and gold mining  
Group's interest 100.00% 100.00%
OZ Minerals Prominent Hill Operations Pty Ltd [member]    
Disclosure of significant subsidiaries [line items]    
Country of incorporation Australia  
Principal activity Copper and gold mining  
Group's interest 100.00% 100.00%
BHP Iron Ore (Jimblebar) Pty Ltd [member]    
Disclosure of significant subsidiaries [line items]    
Country of incorporation [2] Australia  
Principal activity [2] Iron ore mining  
Group's interest [2] 85.00% 85.00%
BHP Iron Ore Pty Ltd [member]    
Disclosure of significant subsidiaries [line items]    
Country of incorporation Australia  
Principal activity Service company  
Group's interest 100.00% 100.00%
BHP (Towage Services) Pty Ltd [member]    
Disclosure of significant subsidiaries [line items]    
Country of incorporation Australia  
Principal activity Towing services  
Group's 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's 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's 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's 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's interest 100.00% 100.00%
BHP Billiton Finance Limited [member]    
Disclosure of significant subsidiaries [line items]    
Country of incorporation Australia  
Principal activity Finance  
Group's 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's interest 100.00% 100.00%
BHP Billiton Group Limited [Member]    
Disclosure of significant subsidiaries [line items]    
Country of incorporation United Kingdom  
Principal activity Holding company  
Group's interest 100.00% 100.00%
BHP Canada Inc. [member]    
Disclosure of significant subsidiaries [line items]    
Country of incorporation Canada  
Principal activity Potash development  
Group's interest 100.00% 100.00%
BHP Group Operations Pty Ltd [member]    
Disclosure of significant subsidiaries [line items]    
Country of incorporation Australia  
Principal activity Administrative services  
Group's interest 100.00% 100.00%
BHP Nickel West Pty Ltd [Member]    
Disclosure of significant subsidiaries [line items]    
Country of incorporation [3] Australia  
Principal activity [3] Nickel mining, smelting, refining and administrative services  
Group's interest [3] 100.00% 100.00%
OZ Minerals Musgrave Operations Pty Ltd [member]    
Disclosure of significant subsidiaries [line items]    
Country of incorporation [3] Australia  
Principal activity [3] Nickel and copper development  
Group's interest [3] 100.00% 100.00%
WMC Finance (USA) Limited [member]    
Disclosure of significant subsidiaries [line items]    
Country of incorporation Australia  
Principal activity Finance  
Group's interest 100.00% 100.00%
[1] As the Group has the ability to direct the relevant activities at Minera Escondida Ltda, it has control over the entity. The assessment of the most relevant activity in this contractual arrangement is subject to judgement. The Group establishes the mine plan and the operating budget and has the ability to appoint the key management personnel, demonstrating that the Group has the existing rights to direct the relevant activities of Minera Escondida Ltda.
[2] The Group has an effective interest of 92.5 per cent in BHP Iron Ore (Jimblebar) Pty Ltd; however, by virtue of the shareholder agreement with ITOCHU Iron Ore Australia Pty Ltd and Mitsui & Co. Iron Ore Exploration & Mining Pty Ltd, the Group’s interest in the Jimblebar mining operation is 85 per cent, which is consistent with the other respective contractual arrangements at Western Australia Iron Ore.
[3] The Nickel West operations and the West Musgrave project both transitioned into temporary suspension in December 2024.