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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)

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