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Segment Reporting - Summary of Reportable Segments (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
Underlying EBITDA 23,158 23,183 19,350
Depreciation and amortisation (5,829) (6,288) (5,972)
Impairment losses (264) (333) (188)
Underlying EBIT 17,065 16,562 13,190
Exceptional items (952) (566) (636)
Net finance costs (1,064) (1,245) (1,417)
Profit (loss) before taxation 15,049 14,751 11,137
Capital expenditure (cash basis) 6,250 4,979 3,697
(Loss)/profit from equity accounted investments, related impairments and expenses (546) 147 272
Investments accounted for using the equity method 2,569 2,473 2,448
Total assets 100,861 111,993 117,006
Total liabilities 49,037 51,323 54,280
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
Underlying EBITDA 3,801 3,341 3,117
Depreciation and amortisation (1,560) (1,719) (1,648)
Impairment losses (21) (76) (102)
Underlying EBIT 2,220 1,546 1,367
Capital expenditure (cash basis) 645 656 917
(Loss)/profit from equity accounted investments, related impairments and expenses (2) (4) (3)
Investments accounted for using the equity method 239 249 264
Total assets 12,465 12,938 13,726
Total liabilities 5,237 4,886 4,715
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] | Copper [member]      
Disclosure of reportable segments [line items]      
Revenue 10,838 12,781 7,942
Underlying EBITDA 4,550 6,522 3,545
Depreciation and amortisation (1,835) (1,920) (1,525)
Impairment losses (128) (213) (14)
Underlying EBIT 2,587 4,389 2,006
Exceptional items     (546)
Capital expenditure (cash basis) 2,735 2,428 1,484
(Loss)/profit from equity accounted investments, related impairments and expenses 303 467 295
Investments accounted for using the equity method 1,472 1,335 1,306
Total assets 27,428 26,824 26,743
Total liabilities 3,340 3,145 2,643
Reportable segments [member] | Copper [member] | Revenue [member]      
Disclosure of reportable segments [line items]      
Revenue 10,838 12,781 7,942
Reportable segments [member] | Iron Ore [member]      
Disclosure of reportable segments [line items]      
Revenue 17,255 14,810 14,624
Underlying EBITDA 11,129 8,930 9,077
Depreciation and amortisation (1,653) (1,721) (1,828)
Impairment losses (79) (14) (52)
Underlying EBIT 9,397 7,195 7,197
Exceptional items (971) (539) (203)
Capital expenditure (cash basis) 1,611 1,074 805
(Loss)/profit from equity accounted investments, related impairments and expenses (945) (509) (172)
Total assets 22,592 22,208 22,781
Total liabilities 5,106 3,888 3,606
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] | Coal [member]      
Disclosure of reportable segments [line items]      
Revenue 9,121 8,889 7,578
Underlying EBITDA 4,067 4,397 3,784
Depreciation and amortisation (632) (686) (719)
Impairment losses (35) (29) (15)
Underlying EBIT 3,400 3,682 3,050
Exceptional items     164
Capital expenditure (cash basis) 655 409 246
(Loss)/profit from equity accounted investments, related impairments and expenses 103 192 152
Investments accounted for using the equity method 853 883 873
Total assets 12,124 12,257 11,996
Total liabilities 2,450 2,404 1,860
Reportable segments [member] | Coal [member] | Revenue [member]      
Disclosure of reportable segments [line items]      
Revenue 9,121 8,889 7,578
Group and unallocated items/eliminations [member]      
Disclosure of reportable segments [line items]      
Revenue 1,144 1,241 874
Underlying EBITDA (389) (7) (173)
Depreciation and amortisation (149) (242) (252)
Impairment losses (1) (1) (5)
Underlying EBIT (539) (250) (430)
Exceptional items 19 (27) (51)
Capital expenditure (cash basis) 604 412 245
(Loss)/profit from equity accounted investments, related impairments and expenses (5) 1  
Investments accounted for using the equity method 5 6 5
Total assets 26,252 37,766 41,760
Total liabilities 32,904 37,000 41,456
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)