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Climate change - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended 120 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2030
Disclosure Of Climate Change [Line Items]        
Assets (liabilities) $ (48,530) $ (48,766)    
Property, plant and equipment 71,818 61,295 $ 73,813  
Expenditure on carbon credits 15      
Additions to right-of-use assets $ 542 866    
Percentage of increase in metallurgical coal closure and rehabilitation provisions Cost 15.00%      
Increase in metallurgical coal closure and rehabilitation provisions Cost $ 250      
Amount By which metallurgical coal assets carrying value of asset exceedsIts estimated valuation 6,500      
Entity estimated decarbonisation capital expenditure 4,000      
Entity estimated capital expenditure 4,000      
Revenue 53,817 65,098 56,921  
Copper Commodity [Member]        
Disclosure Of Climate Change [Line Items]        
Revenue 14,900 16,000    
Nickel Commodity [Member]        
Disclosure Of Climate Change [Line Items]        
Revenue 1,900 1,700    
Nickel Commodity Batterysuitable3 [Member]        
Disclosure Of Climate Change [Line Items]        
Revenue 1,000      
Nickel Commodity Other [Member]        
Disclosure Of Climate Change [Line Items]        
Revenue 900      
Uranium Commodity [Member]        
Disclosure Of Climate Change [Line Items]        
Revenue $ 400 200    
Metallurgical Coal [member]        
Disclosure Of Climate Change [Line Items]        
Reasonably possible acceleration in forecast cash flows 5 years      
Lease Liabilities [member]        
Disclosure Of Climate Change [Line Items]        
Increase through new leases, liabilities arising from financing activities $ 542 866    
New Dual Fuelled LNG Vessels [Member]        
Disclosure Of Climate Change [Line Items]        
Additions to right-of-use assets 90      
New Dual Fuelled LNG Vessels [Member] | Lease Liabilities [member]        
Disclosure Of Climate Change [Line Items]        
Increase through new leases, liabilities arising from financing activities 90      
Renewable Power Purchase Agreements [Member]        
Disclosure Of Climate Change [Line Items]        
Derivative financial assets 50      
Coal [member] | Metallurgical Coal [member]        
Disclosure Of Climate Change [Line Items]        
Revenue 7,430 11,990 4,260  
Operating segments [member] | Coal [member]        
Disclosure Of Climate Change [Line Items]        
Revenue 10,958 15,549 5,154  
Operating segments [member] | Coal [member] | New South Wales Energy Coal [member]        
Disclosure Of Climate Change [Line Items]        
Assets (liabilities) 220      
Property, plant and equipment 530      
Provisions and other liabilities 750      
Revenue $ 3,306 $ 3,035 $ 839  
Scenario Forecast [member]        
Disclosure Of Climate Change [Line Items]        
Decrease In Percentage Of Reduction Of Operational GHG Emissions       30.00%
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% 6.00%    
Top of range [member] | Operating segments [member]        
Disclosure Of Climate Change [Line Items]        
Discount rate used in current estimate of value in use 9.50% 8.50%