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Revenue - Summary of Revenue by Segment and Asset (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Disclosure of reportable segments [line items]      
Revenue $ 42,931 $ 44,288 $ 43,129
Revenue [member]      
Disclosure of reportable segments [line items]      
Revenue 42,931 44,288 43,129
Reportable segments [member] | Petroleum [member]      
Disclosure of reportable segments [line items]      
Revenue 4,070 5,930 5,408
Reportable segments [member] | Petroleum [member] | Revenue [member]      
Disclosure of reportable segments [line items]      
Revenue 4,008 5,853 5,333
Reportable segments [member] | Petroleum [member] | Inter-segment revenue [member]      
Disclosure of reportable segments [line items]      
Revenue 62 77 75
Reportable segments [member] | Petroleum [member] | Australia Production Unit [member]      
Disclosure of reportable segments [line items]      
Revenue 361 507 568
Reportable segments [member] | Petroleum [member] | Bass Strait Australia [member]      
Disclosure of reportable segments [line items]      
Revenue 1,102 1,237 1,285
Reportable segments [member] | Petroleum [member] | North West Shelf Australia [member]      
Disclosure of reportable segments [line items]      
Revenue 1,076 1,657 1,400
Reportable segments [member] | Petroleum [member] | Atlantis [member]      
Disclosure of reportable segments [line items]      
Revenue 561 979 833
Reportable segments [member] | Petroleum [member] | Shenzi [member]      
Disclosure of reportable segments [line items]      
Revenue 277 540 576
Reportable segments [member] | Petroleum [member] | Mad Dog [member]      
Disclosure of reportable segments [line items]      
Revenue 216 319 229
Reportable segments [member] | Petroleum [member] | Trinidad/Tobago [member]      
Disclosure of reportable segments [line items]      
Revenue 191 287 161
Reportable segments [member] | Petroleum [member] | Algeria [member]      
Disclosure of reportable segments [line items]      
Revenue 159 258 234
Reportable segments [member] | Petroleum [member] | Third party products [member]      
Disclosure of reportable segments [line items]      
Revenue 39 10 12
Reportable segments [member] | Petroleum [member] | Other [member]      
Disclosure of reportable segments [line items]      
Revenue 88 136 110
Reportable segments [member] | Copper [member]      
Disclosure of reportable segments [line items]      
Revenue 10,666 10,838 12,781
Reportable segments [member] | Copper [member] | Revenue [member]      
Disclosure of reportable segments [line items]      
Revenue 10,666 10,838 12,781
Reportable segments [member] | Copper [member] | Third party products [member]      
Disclosure of reportable segments [line items]      
Revenue 1,089 1,109 1,349
Reportable segments [member] | Copper [member] | Escondida [member]      
Disclosure of reportable segments [line items]      
Revenue 6,719 6,876 8,346
Reportable segments [member] | Copper [member] | Pampa Norte [member]      
Disclosure of reportable segments [line items]      
Revenue 1,395 1,502 1,831
Reportable segments [member] | Copper [member] | Olympic Dam [member]      
Disclosure of reportable segments [line items]      
Revenue 1,463 1,351 1,255
Reportable segments [member] | Iron Ore [member]      
Disclosure of reportable segments [line items]      
Revenue 20,797 17,255 14,810
Reportable segments [member] | Iron Ore [member] | Revenue [member]      
Disclosure of reportable segments [line items]      
Revenue 20,797 17,251 14,797
Reportable segments [member] | Iron Ore [member] | Inter-segment revenue [member]      
Disclosure of reportable segments [line items]      
Revenue   4 13
Reportable segments [member] | Iron Ore [member] | Third party products [member]      
Disclosure of reportable segments [line items]      
Revenue 15 32 54
Reportable segments [member] | Iron Ore [member] | Other [member]      
Disclosure of reportable segments [line items]      
Revenue 119 157 160
Reportable segments [member] | Iron Ore [member] | Western Australia Iron Ore [member]      
Disclosure of reportable segments [line items]      
Revenue 20,663 17,066 14,596
Reportable segments [member] | Coal [member]      
Disclosure of reportable segments [line items]      
Revenue 6,242 9,121 8,889
Reportable segments [member] | Coal [member] | Revenue [member]      
Disclosure of reportable segments [line items]      
Revenue 6,241 9,121 8,889
Reportable segments [member] | Coal [member] | Inter-segment revenue [member]      
Disclosure of reportable segments [line items]      
Revenue 1    
Reportable segments [member] | Coal [member] | Third party products [member]      
Disclosure of reportable segments [line items]      
Revenue   19 2
Reportable segments [member] | Coal [member] | Other [member]      
Disclosure of reportable segments [line items]      
Revenue   2  
Reportable segments [member] | Coal [member] | Queensland Coal [member]      
Disclosure of reportable segments [line items]      
Revenue 5,357 7,679 7,388
Reportable segments [member] | Coal [member] | New South Wales Energy Coal [member]      
Disclosure of reportable segments [line items]      
Revenue 885 1,421 1,499
Group and unallocated items/eliminations [member]      
Disclosure of reportable segments [line items]      
Revenue 1,156 1,144 1,241
Group and unallocated items/eliminations [member] | Revenue [member]      
Disclosure of reportable segments [line items]      
Revenue 1,219 1,225 1,329
Group and unallocated items/eliminations [member] | Inter-segment revenue [member]      
Disclosure of reportable segments [line items]      
Revenue $ (63) $ (81) $ (88)