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Revenue - Summary of Revenue by Segment and Asset (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Disclosure of reportable segments [line items]      
Revenue $ 53,817 $ 65,098 $ 56,921
Revenue [member]      
Disclosure of reportable segments [line items]      
Revenue 53,817 65,098 56,921
Operating segments [member] | Copper [member]      
Disclosure of reportable segments [line items]      
Revenue 16,027 16,849 15,726
Operating segments [member] | Copper [member] | Revenue [member]      
Disclosure of reportable segments [line items]      
Revenue 16,027 16,849 15,726
Operating segments [member] | Copper [member] | Escondida [member]      
Disclosure of reportable segments [line items]      
Revenue 8,847 9,500 9,470
Operating segments [member] | Copper [member] | Pampa Norte [member]      
Disclosure of reportable segments [line items]      
Revenue 2,491 2,670 1,801
Operating segments [member] | Copper [member] | Copper South Australia [member]      
Disclosure of reportable segments [line items]      
Revenue 2,806 1,776 2,211
Operating segments [member] | Copper [member] | Third party products [member]      
Disclosure of reportable segments [line items]      
Revenue 1,863 2,903 2,244
Operating segments [member] | Copper [member] | Other [member]      
Disclosure of reportable segments [line items]      
Revenue 20    
Operating segments [member] | Iron Ore [member]      
Disclosure of reportable segments [line items]      
Revenue 24,812 30,767 34,475
Operating segments [member] | Iron Ore [member] | Revenue [member]      
Disclosure of reportable segments [line items]      
Revenue 24,812 30,767 34,475
Operating segments [member] | Iron Ore [member] | Western Australia Iron Ore [member]      
Disclosure of reportable segments [line items]      
Revenue 24,678 30,632 34,337
Operating segments [member] | Iron Ore [member] | Third party products [member]      
Disclosure of reportable segments [line items]      
Revenue 21 19 18
Operating segments [member] | Iron Ore [member] | Other [member]      
Disclosure of reportable segments [line items]      
Revenue 113 116 120
Operating segments [member] | Coal [member]      
Disclosure of reportable segments [line items]      
Revenue 10,958 15,549 5,154
Operating segments [member] | Coal [member] | Revenue [member]      
Disclosure of reportable segments [line items]      
Revenue 10,958 15,549 5,154
Operating segments [member] | Coal [member] | BHP Mitsubishi Alliance [Member]      
Disclosure of reportable segments [line items]      
Revenue 7,652 10,254 3,537
Operating segments [member] | Coal [member] | New South Wales Energy Coal [member]      
Disclosure of reportable segments [line items]      
Revenue 3,306 3,035 839
Operating segments [member] | Coal [member] | Other [member]      
Disclosure of reportable segments [line items]      
Revenue   2,260 778
Group and unallocated items/eliminations [member]      
Disclosure of reportable segments [line items]      
Revenue 2,020 1,933 1,566
Group and unallocated items/eliminations [member] | Revenue [member]      
Disclosure of reportable segments [line items]      
Revenue $ 2,020 $ 1,933 $ 1,566