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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)

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