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Revenue - Summary of Revenue by Segment and Asset (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Disclosure of reportable segments [line items] |  |  |
Revenue | $ 44,288 | $ 43,129 | $ 35,740
Revenue [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 44,288 | 43,129 | 35,740
Reportable segments [member] | Petroleum [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 5,930 | 5,408 | 4,722
Reportable segments [member] | Petroleum [member] | Revenue [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 5,853 | 5,333 | 4,639
Reportable segments [member] | Petroleum [member] | Inter-segment revenue [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 77 | 75 | 83
Reportable segments [member] | Petroleum [member] | Australia Production Unit [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 507 | 568 | 601
Reportable segments [member] | Petroleum [member] | Bass Strait Australia [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 1,237 | 1,285 | 1,096
Reportable segments [member] | Petroleum [member] | North West Shelf Australia [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 1,657 | 1,400 | 1,190
Reportable segments [member] | Petroleum [member] | Atlantis [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 979 | 833 | 677
Reportable segments [member] | Petroleum [member] | Shenzi [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 540 | 576 | 509
Reportable segments [member] | Petroleum [member] | Mad Dog [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 319 | 229 | 202
Reportable segments [member] | Petroleum [member] | Trinidad/Tobago [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 287 | 161 | 110
Reportable segments [member] | Petroleum [member] | Algeria [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 258 | 234 | 212
Reportable segments [member] | Petroleum [member] | Third party products [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 10 | 12 | 9
Reportable segments [member] | Petroleum [member] | Other [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 136 | 110 | 116
Reportable segments [member] | Copper [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 10,838 | 12,781 | 7,942
Reportable segments [member] | Copper [member] | Revenue [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 10,838 | 12,781 | 7,942
Reportable segments [member] | Copper [member] | Third party products [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 1,109 | 1,349 | 1,012
Reportable segments [member] | Copper [member] | Escondida [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 6,876 | 8,346 | 4,242
Reportable segments [member] | Copper [member] | Pampa Norte [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 1,502 | 1,831 | 1,401
Reportable segments [member] | Copper [member] | Olympic Dam [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 1,351 | 1,255 | 1,287
Reportable segments [member] | Iron Ore [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 17,255 | 14,810 | 14,624
Reportable segments [member] | Iron Ore [member] | Revenue [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 17,251 | 14,797 | 14,606
Reportable segments [member] | Iron Ore [member] | Inter-segment revenue [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 4 | 13 | 18
Reportable segments [member] | Iron Ore [member] | Third party products [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 32 | 54 | 81
Reportable segments [member] | Iron Ore [member] | Other [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 157 | 160 | 148
Reportable segments [member] | Iron Ore [member] | Western Australia Iron Ore [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 17,066 | 14,596 | 14,395
Reportable segments [member] | Coal [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 9,121 | 8,889 | 7,578
Reportable segments [member] | Coal [member] | Revenue [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 9,121 | 8,889 | 7,578
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 |  | 11
Reportable segments [member] | Coal [member] | Queensland Coal [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 7,679 | 7,388 | 6,316
Reportable segments [member] | Coal [member] | New South Wales Energy Coal [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 1,421 | 1,499 | 1,251
Group and unallocated items/eliminations [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 1,144 | 1,241 | 874
Group and unallocated items/eliminations [member] | Revenue [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 1,225 | 1,329 | 975
Group and unallocated items/eliminations [member] | Inter-segment revenue [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | $ (81) | $ (88) | $ (101)

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