v3.25.2
Revenue - Summary of Revenue by Segment and Asset (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2023
Disclosure of reportable segments [line items]      
Revenue $ 51,262 $ 55,658 $ 53,817
Revenue [member]      
Disclosure of reportable segments [line items]      
Revenue 51,262 55,658 53,817
Operating segments [member] | Copper [member]      
Disclosure of reportable segments [line items]      
Revenue 22,530 18,566 16,027
Operating segments [member] | Copper [member] | Revenue [member]      
Disclosure of reportable segments [line items]      
Revenue 22,530 18,566 16,027
Operating segments [member] | Copper [member] | Escondida [member]      
Disclosure of reportable segments [line items]      
Revenue 13,177 10,013 8,847
Operating segments [member] | Copper [member] | Pampa Norte [member]      
Disclosure of reportable segments [line items]      
Revenue 2,726 2,375 2,491
Operating segments [member] | Copper [member] | Copper South Australia [member]      
Disclosure of reportable segments [line items]      
Revenue 4,655 4,085 2,806
Operating segments [member] | Copper [member] | Third party products [member]      
Disclosure of reportable segments [line items]      
Revenue 1,845 2,021 1,863
Operating segments [member] | Copper [member] | Other [member]      
Disclosure of reportable segments [line items]      
Revenue 127 72 20
Operating segments [member] | Iron Ore [member]      
Disclosure of reportable segments [line items]      
Revenue 22,919 27,952 24,812
Operating segments [member] | Iron Ore [member] | Revenue [member]      
Disclosure of reportable segments [line items]      
Revenue 22,919 27,952 24,812
Operating segments [member] | Iron Ore [member] | Western Australia Iron Ore [member]      
Disclosure of reportable segments [line items]      
Revenue 22,767 27,805 24,678
Operating segments [member] | Iron Ore [member] | Third party products [member]      
Disclosure of reportable segments [line items]      
Revenue 28 25 21
Operating segments [member] | Iron Ore [member] | Other [member]      
Disclosure of reportable segments [line items]      
Revenue 124 122 113
Operating segments [member] | Coal [member]      
Disclosure of reportable segments [line items]      
Revenue 5,046 7,666 10,958
Operating segments [member] | Coal [member] | Revenue [member]      
Disclosure of reportable segments [line items]      
Revenue 5,046 7,666 10,958
Operating segments [member] | Coal [member] | BHP Mitsubishi Alliance [Member]      
Disclosure of reportable segments [line items]      
Revenue 3,422 5,873 7,652
Operating segments [member] | Coal [member] | New South Wales Energy Coal [member]      
Disclosure of reportable segments [line items]      
Revenue 1,624 1,793 3,306
Group and unallocated items/eliminations [member]      
Disclosure of reportable segments [line items]      
Revenue 767 1,474 2,020
Group and unallocated items/eliminations [member] | Revenue [member]      
Disclosure of reportable segments [line items]      
Revenue $ 767 $ 1,474 $ 2,020