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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)