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Revenue - Summary of Revenue by Segment and Asset (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Disclosure of reportable segments [line items]      
Revenue $ 55,658 $ 53,817 $ 65,098
Revenue [member]      
Disclosure of reportable segments [line items]      
Revenue 55,658 53,817 65,098
Operating segments [member] | Copper [member]      
Disclosure of reportable segments [line items]      
Revenue 18,566 16,027 16,849
Operating segments [member] | Copper [member] | Revenue [member]      
Disclosure of reportable segments [line items]      
Revenue 18,566 16,027 16,849
Operating segments [member] | Copper [member] | Escondida [member]      
Disclosure of reportable segments [line items]      
Revenue 10,013 8,847 9,500
Operating segments [member] | Copper [member] | Pampa Norte [member]      
Disclosure of reportable segments [line items]      
Revenue 2,375 2,491 2,670
Operating segments [member] | Copper [member] | Copper South Australia [member]      
Disclosure of reportable segments [line items]      
Revenue 4,085 2,806 1,776
Operating segments [member] | Copper [member] | Third party products [member]      
Disclosure of reportable segments [line items]      
Revenue 2,021 1,863 2,903
Operating segments [member] | Copper [member] | Other [member]      
Disclosure of reportable segments [line items]      
Revenue 72 20  
Operating segments [member] | Iron Ore [member]      
Disclosure of reportable segments [line items]      
Revenue 27,952 24,812 30,767
Operating segments [member] | Iron Ore [member] | Revenue [member]      
Disclosure of reportable segments [line items]      
Revenue 27,952 24,812 30,767
Operating segments [member] | Iron Ore [member] | Western Australia Iron Ore [member]      
Disclosure of reportable segments [line items]      
Revenue 27,805 24,678 30,632
Operating segments [member] | Iron Ore [member] | Third party products [member]      
Disclosure of reportable segments [line items]      
Revenue 25 21 19
Operating segments [member] | Iron Ore [member] | Other [member]      
Disclosure of reportable segments [line items]      
Revenue 122 113 116
Operating segments [member] | Coal [member]      
Disclosure of reportable segments [line items]      
Revenue 7,666 10,958 15,549
Operating segments [member] | Coal [member] | Revenue [member]      
Disclosure of reportable segments [line items]      
Revenue 7,666 10,958 15,549
Operating segments [member] | Coal [member] | BHP Mitsubishi Alliance [Member]      
Disclosure of reportable segments [line items]      
Revenue 5,873 7,652 10,254
Operating segments [member] | Coal [member] | New South Wales Energy Coal [member]      
Disclosure of reportable segments [line items]      
Revenue 1,793 3,306 3,035
Operating segments [member] | Coal [member] | Other [member]      
Disclosure of reportable segments [line items]      
Revenue     2,260
Group and unallocated items/eliminations [member]      
Disclosure of reportable segments [line items]      
Revenue 1,474 2,020 1,933
Group and unallocated items/eliminations [member] | Revenue [member]      
Disclosure of reportable segments [line items]      
Revenue $ 1,474 $ 2,020 $ 1,933