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Revenue - Summary of Revenue by Segment and Asset (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Disclosure of reportable segments [line items]      
Revenue $ 60,817 $ 42,931 $ 44,288
Revenue [member]      
Disclosure of reportable segments [line items]      
Revenue 60,817 42,931 44,288
Operating segments [member] | Petroleum [member]      
Disclosure of reportable segments [line items]      
Revenue 3,946 4,070 5,930
Operating segments [member] | Petroleum [member] | Revenue [member]      
Disclosure of reportable segments [line items]      
Revenue 3,895 4,008 5,853
Operating segments [member] | Petroleum [member] | Inter-segment revenue [member]      
Disclosure of reportable segments [line items]      
Revenue 51 62 77
Operating segments [member] | Petroleum [member] | Australia Production Unit [member]      
Disclosure of reportable segments [line items]      
Revenue 327 361 507
Operating segments [member] | Petroleum [member] | Bass Strait Australia [member]      
Disclosure of reportable segments [line items]      
Revenue 1,066 1,102 1,237
Operating segments [member] | Petroleum [member] | North West Shelf Australia [member]      
Disclosure of reportable segments [line items]      
Revenue 893 1,076 1,657
Operating segments [member] | Petroleum [member] | Atlantis [member]      
Disclosure of reportable segments [line items]      
Revenue 560 561 979
Operating segments [member] | Petroleum [member] | Shenzi [member]      
Disclosure of reportable segments [line items]      
Revenue 417 277 540
Operating segments [member] | Petroleum [member] | Mad Dog [member]      
Disclosure of reportable segments [line items]      
Revenue 231 216 319
Operating segments [member] | Petroleum [member] | Trinidad/Tobago [member]      
Disclosure of reportable segments [line items]      
Revenue 204 191 287
Operating segments [member] | Petroleum [member] | Algeria [member]      
Disclosure of reportable segments [line items]      
Revenue 164 159 258
Operating segments [member] | Petroleum [member] | Third party products [member]      
Disclosure of reportable segments [line items]      
Revenue 11 39 10
Operating segments [member] | Petroleum [member] | Other [member]      
Disclosure of reportable segments [line items]      
Revenue 73 88 136
Operating segments [member] | Copper [member]      
Disclosure of reportable segments [line items]      
Revenue 15,726 10,666 10,838
Operating segments [member] | Copper [member] | Revenue [member]      
Disclosure of reportable segments [line items]      
Revenue 15,726 10,666 10,838
Operating segments [member] | Copper [member] | Third party products [member]      
Disclosure of reportable segments [line items]      
Revenue 2,244 1,089 1,109
Operating segments [member] | Copper [member] | Escondida [member]      
Disclosure of reportable segments [line items]      
Revenue 9,470 6,719 6,876
Operating segments [member] | Copper [member] | Pampa Norte [member]      
Disclosure of reportable segments [line items]      
Revenue 1,801 1,395 1,502
Operating segments [member] | Copper [member] | Olympic Dam [member]      
Disclosure of reportable segments [line items]      
Revenue 2,211 1,463 1,351
Operating segments [member] | Iron Ore [member]      
Disclosure of reportable segments [line items]      
Revenue 34,475 20,797 17,255
Operating segments [member] | Iron Ore [member] | Revenue [member]      
Disclosure of reportable segments [line items]      
Revenue 34,475 20,797 17,251
Operating segments [member] | Iron Ore [member] | Inter-segment revenue [member]      
Disclosure of reportable segments [line items]      
Revenue     4
Operating segments [member] | Iron Ore [member] | Third party products [member]      
Disclosure of reportable segments [line items]      
Revenue 18 15 32
Operating segments [member] | Iron Ore [member] | Other [member]      
Disclosure of reportable segments [line items]      
Revenue 120 119 157
Operating segments [member] | Iron Ore [member] | Western Australia Iron Ore [member]      
Disclosure of reportable segments [line items]      
Revenue 34,337 20,663 17,066
Operating segments [member] | Coal [member]      
Disclosure of reportable segments [line items]      
Revenue 5,154 6,242 9,121
Operating segments [member] | Coal [member] | Revenue [member]      
Disclosure of reportable segments [line items]      
Revenue 5,154 6,241 9,121
Operating segments [member] | Coal [member] | Inter-segment revenue [member]      
Disclosure of reportable segments [line items]      
Revenue   1  
Operating segments [member] | Coal [member] | Third party products [member]      
Disclosure of reportable segments [line items]      
Revenue     19
Operating segments [member] | Coal [member] | Other [member]      
Disclosure of reportable segments [line items]      
Revenue     2
Operating segments [member] | Coal [member] | Queensland Coal [member]      
Disclosure of reportable segments [line items]      
Revenue 4,315 5,357 7,679
Operating segments [member] | Coal [member] | New South Wales Energy Coal [member]      
Disclosure of reportable segments [line items]      
Revenue 839 885 1,421
Group and unallocated items/eliminations [member]      
Disclosure of reportable segments [line items]      
Revenue 1,516 1,156 1,144
Group and unallocated items/eliminations [member] | Revenue [member]      
Disclosure of reportable segments [line items]      
Revenue 1,567 1,219 1,225
Group and unallocated items/eliminations [member] | Inter-segment revenue [member]      
Disclosure of reportable segments [line items]      
Revenue $ (51) $ (63) $ (81)