v3.25.2
Subsidiaries - Summary of Significant Subsidiaries (Detail)
12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
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 Chile  
Principal activity Copper mining  
Group's interest 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 Australia  
Principal activity Iron ore mining  
Group's interest 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 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 Australia  
Principal activity Nickel mining, smelting, refining and administrative services  
Group's interest 100.00% 100.00%
OZ Minerals Musgrave Operations Pty Ltd [member]    
Disclosure of significant subsidiaries [line items]    
Country of incorporation Australia  
Principal activity Nickel and copper development  
Group's interest 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%