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Revenue - Summary of Revenue by Segment and Asset (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Disclosure of reportable segments [line items]      
Revenue $ 65,098 $ 56,921 $ 38,924
Revenue [member]      
Disclosure of reportable segments [line items]      
Revenue 65,098 56,921 38,924
Operating segments [member] | Copper [member]      
Disclosure of reportable segments [line items]      
Revenue 16,849 15,726 10,666
Operating segments [member] | Copper [member] | Revenue [member]      
Disclosure of reportable segments [line items]      
Revenue 16,849 15,726 10,666
Operating segments [member] | Copper [member] | Escondida [member]      
Disclosure of reportable segments [line items]      
Revenue 9,500 9,470 6,719
Operating segments [member] | Copper [member] | Pampa Norte [member]      
Disclosure of reportable segments [line items]      
Revenue 2,670 1,801 1,395
Operating segments [member] | Copper [member] | Olympic Dam [member]      
Disclosure of reportable segments [line items]      
Revenue 1,776 2,211 1,463
Operating segments [member] | Copper [member] | Third party products [member]      
Disclosure of reportable segments [line items]      
Revenue 2,903 2,244 1,089
Operating segments [member] | Iron Ore [member]      
Disclosure of reportable segments [line items]      
Revenue 30,767 34,475 20,797
Operating segments [member] | Iron Ore [member] | Revenue [member]      
Disclosure of reportable segments [line items]      
Revenue 30,767 34,475 20,797
Operating segments [member] | Iron Ore [member] | Third party products [member]      
Disclosure of reportable segments [line items]      
Revenue 19 18 15
Operating segments [member] | Iron Ore [member] | Western Australia Iron Ore [member]      
Disclosure of reportable segments [line items]      
Revenue 30,632 34,337 20,663
Operating segments [member] | Iron Ore [member] | Other [member]      
Disclosure of reportable segments [line items]      
Revenue 116 120 119
Operating segments [member] | Coal [member]      
Disclosure of reportable segments [line items]      
Revenue 15,549 5,154 6,242
Operating segments [member] | Coal [member] | Revenue [member]      
Disclosure of reportable segments [line items]      
Revenue 15,549 5,154 6,241
Operating segments [member] | Coal [member] | Inter-segment revenue [member]      
Disclosure of reportable segments [line items]      
Revenue     1
Operating segments [member] | Coal [member] | BHP Mitsubishi Alliance [Member]      
Disclosure of reportable segments [line items]      
Revenue 10,254 3,537 4,422
Operating segments [member] | Coal [member] | New South Wales Energy Coal [member]      
Disclosure of reportable segments [line items]      
Revenue 3,035 839 885
Operating segments [member] | Coal [member] | Other [member]      
Disclosure of reportable segments [line items]      
Revenue 2,260 778 935
Group and unallocated items/eliminations [member]      
Disclosure of reportable segments [line items]      
Revenue 1,933 1,566 1,219
Group and unallocated items/eliminations [member] | Revenue [member]      
Disclosure of reportable segments [line items]      
Revenue $ 1,933 $ 1,566 1,220
Group and unallocated items/eliminations [member] | Inter-segment revenue [member]      
Disclosure of reportable segments [line items]      
Revenue     $ (1)