v3.26.1
Climate change - Additional Information (Detail)
$ in Millions
 12 Months Ended 132 Months Ended
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2030
MtCO2e / $
Jun. 30, 2050
MtCO2e / $
Jun. 30, 2024
USD ($)
Disclosure Of Climate Change [Line Items]          
Property, plant and equipment $ 80,046 [1] $ 76,457 [1]     $ 71,629
Lease liabilities [2],[3] 3,496 2,953      
Other financial assets 1,530 1,683      
Expenditure to support value chain 36        
Asset Impairment Loss 2,408 261      
Carbon credits available for trading 0 0      
Carbon credits held for surrender 22 19      
Prepayment Of Carbon Credit 49 $ 32      
Expenditure On Operational Decarbonisation 65        
Operating segments [member] | Coal [member] | New South Wales Energy Coal [member]          
Disclosure Of Climate Change [Line Items]          
Provisions ​for equitable transition 0        
Operating segments [member] | Coal [member] | BHP Mitsubishi Alliance [Member]          
Disclosure Of Climate Change [Line Items]          
Increase decrease in rehabilitation provision due to change in the life of mines $ 44        
Scenario Forecast [member]          
Disclosure Of Climate Change [Line Items]          
Decrease In Percentage Of Reduction Of Operational GHG Emissions     30.00%    
Bottom of range [member]          
Disclosure Of Climate Change [Line Items]          
Internal Carbon Price Assuimptions | MtCO2e / $     0 0  
Bottom of range [member] | Operating segments [member]          
Disclosure Of Climate Change [Line Items]          
Discount rate used in current estimate of value in use 7.00% 7.00%      
Top of range [member]          
Disclosure Of Climate Change [Line Items]          
Internal Carbon Price Assuimptions | MtCO2e / $     146 250  
Top of range [member] | Operating segments [member]          
Disclosure Of Climate Change [Line Items]          
Discount rate used in current estimate of value in use 10.00% 9.50%      
[1] Includes the carrying value of the Group’s right-of-use assets relating to land and buildings and plant and equipment of US$3,030 million (2025: US$2,653 million). Refer to note 22 'Leases' for the movement of the right-of-use assets.
[2] Lease liabilities are measured in accordance with IFRS 16/AASB 16 ‘Leases’.
[3] Lease liabilities due for payment in more than five years includes US$734 million (2025: US$820 million) due for payment in more than ten years.