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Segment Reporting - Summary of Reportable Segments (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Disclosure of reportable segments [Line Items]      
Revenue $ 43,638 $ 36,135 $ 28,567
Underlying EBITDA 23,183 19,350 11,720
Depreciation and amortisation (6,288) (5,972) (6,210)
Impairment losses (333) (188) (186)
Underlying EBIT 16,562 13,190 5,324
Exceptional items (566) (636) (2,520)
Net finance costs (1,245) (1,417) (1,013)
Profit (loss) before taxation 14,751 11,137 1,791
Capital expenditure (cash basis) 4,979 3,697 5,707
Profit/(loss) from equity accounted investments, related impairments and expenses 147 272 (2,104)
Investments accounted for using the equity method 2,473 2,448 2,575
Total assets 111,993 117,006 118,953
Total liabilities 51,323 54,280 58,882
Revenue [member]      
Disclosure of reportable segments [Line Items]      
Revenue 43,638 36,135 28,567
Reportable segments [member] | Petroleum [member]      
Disclosure of reportable segments [Line Items]      
Revenue 5,408 4,722 4,549
Underlying EBITDA 3,341 3,117 3,038
Depreciation and amortisation (1,719) (1,648) (1,696)
Impairment losses (76) (102) (24)
Underlying EBIT 1,546 1,367 1,318
Capital expenditure (cash basis) 656 917 1,278
Profit/(loss) from equity accounted investments, related impairments and expenses (4) (3) (7)
Investments accounted for using the equity method 249 264 280
Total assets 12,938 13,726 14,120
Total liabilities 4,886 4,715 4,264
Reportable segments [member] | Petroleum [member] | Revenue [member]      
Disclosure of reportable segments [Line Items]      
Revenue 5,333 4,639 4,431
Reportable segments [member] | Petroleum [member] | Inter-segment revenue [member]      
Disclosure of reportable segments [Line Items]      
Revenue 75 83 118
Reportable segments [member] | Copper [member]      
Disclosure of reportable segments [Line Items]      
Revenue 13,287 8,335 8,249
Underlying EBITDA 6,522 3,545 2,619
Depreciation and amortisation (1,920) (1,525) (1,560)
Impairment losses (213) (14) (17)
Underlying EBIT 4,389 2,006 1,042
Exceptional items   (546)  
Capital expenditure (cash basis) 2,428 1,484 2,786
Profit/(loss) from equity accounted investments, related impairments and expenses 467 295 155
Investments accounted for using the equity method 1,335 1,306 1,388
Total assets 26,824 26,743 26,143
Total liabilities 3,145 2,643 2,299
Reportable segments [member] | Copper [member] | Revenue [member]      
Disclosure of reportable segments [Line Items]      
Revenue 13,287 8,335 8,249
Reportable segments [member] | Iron Ore [member]      
Disclosure of reportable segments [Line Items]      
Revenue 14,810 14,624 10,538
Underlying EBITDA 8,930 9,077 5,599
Depreciation and amortisation (1,721) (1,828) (1,817)
Impairment losses (14) (52) (42)
Underlying EBIT 7,195 7,197 3,740
Exceptional items (539) (203) (2,388)
Capital expenditure (cash basis) 1,074 805 1,061
Profit/(loss) from equity accounted investments, related impairments and expenses (509) (172) (2,244)
Total assets 22,208 22,781 24,330
Total liabilities 3,888 3,606 3,789
Reportable segments [member] | Iron Ore [member] | Revenue [member]      
Disclosure of reportable segments [Line Items]      
Revenue 14,797 14,606 10,516
Reportable segments [member] | Iron Ore [member] | Inter-segment revenue [member]      
Disclosure of reportable segments [Line Items]      
Revenue 13 18 22
Reportable segments [member] | Coal [member]      
Disclosure of reportable segments [Line Items]      
Revenue 8,889 7,578 4,518
Underlying EBITDA 4,397 3,784 635
Depreciation and amortisation (686) (719) (890)
Impairment losses (29) (15) (94)
Underlying EBIT 3,682 3,050 (349)
Exceptional items   164  
Capital expenditure (cash basis) 409 246 298
Profit/(loss) from equity accounted investments, related impairments and expenses 192 152 (9)
Investments accounted for using the equity method 883 873 901
Total assets 12,257 11,996 12,754
Total liabilities 2,404 1,860 2,103
Reportable segments [member] | Coal [member] | Revenue [member]      
Disclosure of reportable segments [Line Items]      
Revenue 8,889 7,578 4,518
Group and unallocated items/eliminations [member]      
Disclosure of reportable segments [Line Items]      
Revenue 1,244 876 713
Underlying EBITDA (7) (173) (171)
Depreciation and amortisation (242) (252) (247)
Impairment losses (1) (5) (9)
Underlying EBIT (250) (430) (427)
Exceptional items (27) (51) (132)
Capital expenditure (cash basis) 412 245 284
Profit/(loss) from equity accounted investments, related impairments and expenses 1   1
Investments accounted for using the equity method 6 5 6
Total assets 37,766 41,760 41,606
Total liabilities 37,000 41,456 46,427
Group and unallocated items/eliminations [member] | Revenue [member]      
Disclosure of reportable segments [Line Items]      
Revenue 1,332 977 853
Group and unallocated items/eliminations [member] | Inter-segment revenue [member]      
Disclosure of reportable segments [Line Items]      
Revenue $ (88) $ (101) $ (140)