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Segment Reporting - Summary of Reportable Segments (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
Underlying EBITDA 22,071 23,158 23,183
Depreciation and amortisation (6,112) (5,829) (6,288)
Impairment losses (85) (264) (333)
Underlying EBIT 15,874 17,065 16,562
Exceptional items (1,453) (952) (566)
Net finance costs (911) (1,064) (1,245)
Profit before taxation 13,510 15,049 14,751
Capital expenditure (cash basis) 6,900 6,250 4,979
(Loss)/profit from equity accounted investments, related impairments and expenses (512) (546) 147
Investments accounted for using the equity method 2,585 2,569 2,473
Total assets 104,783 100,861 111,993
Total liabilities 52,537 49,037 51,323
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
Underlying EBITDA 2,207 4,061 3,393
Depreciation and amortisation (1,445) (1,560) (1,719)
Impairment losses (12) (21) (76)
Underlying EBIT 750 2,480 1,598
Exceptional items (6)    
Capital expenditure (cash basis) 909 645 656
(Loss)/profit from equity accounted investments, related impairments and expenses (4) (2) (4)
Investments accounted for using the equity method 245 239 249
Total assets 13,071 12,434 12,896
Total liabilities 4,824 4,102 3,977
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] | Copper [member]      
Disclosure of reportable segments [line items]      
Revenue 10,666 10,838 12,781
Underlying EBITDA 4,347 4,550 6,522
Depreciation and amortisation (1,740) (1,835) (1,920)
Impairment losses (17) (128) (213)
Underlying EBIT 2,590 2,587 4,389
Exceptional items (1,228)    
Capital expenditure (cash basis) 2,434 2,735 2,428
(Loss)/profit from equity accounted investments, related impairments and expenses 67 303 467
Investments accounted for using the equity method 1,558 1,472 1,335
Total assets 27,942 27,428 26,824
Total liabilities 3,535 3,340 3,145
Reportable segments [member] | Copper [member] | Revenue [member]      
Disclosure of reportable segments [line items]      
Revenue 10,666 10,838 12,781
Reportable segments [member] | Iron Ore [member]      
Disclosure of reportable segments [line items]      
Revenue 20,797 17,255 14,810
Underlying EBITDA 14,554 11,129 8,930
Depreciation and amortisation (1,608) (1,653) (1,721)
Impairment losses (22) (79) (14)
Underlying EBIT 12,924 9,397 7,195
Exceptional items (614) (971) (539)
Capital expenditure (cash basis) 2,328 1,611 1,074
(Loss)/profit from equity accounted investments, related impairments and expenses (508) (945) (509)
Total assets 23,841 22,592 22,208
Total liabilities 5,441 5,106 3,888
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] | Coal [member]      
Disclosure of reportable segments [line items]      
Revenue 6,242 9,121 8,889
Underlying EBITDA 1,632 4,067 4,397
Depreciation and amortisation (807) (632) (686)
Impairment losses (14) (35) (29)
Underlying EBIT 811 3,400 3,682
Exceptional items (18)    
Capital expenditure (cash basis) 603 655 409
(Loss)/profit from equity accounted investments, related impairments and expenses (68) 103 192
Investments accounted for using the equity method 776 853 883
Total assets 12,110 12,124 12,257
Total liabilities 2,601 2,450 2,404
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    
Group and unallocated items/eliminations [member]      
Disclosure of reportable segments [line items]      
Revenue 1,156 1,144 1,241
Underlying EBITDA (669) (649) (59)
Depreciation and amortisation (512) (149) (242)
Impairment losses (20) (1) (1)
Underlying EBIT (1,201) (799) (302)
Exceptional items 413 19 (27)
Capital expenditure (cash basis) 626 604 412
(Loss)/profit from equity accounted investments, related impairments and expenses 1 (5) 1
Investments accounted for using the equity method 6 5 6
Total assets 27,819 26,283 37,808
Total liabilities 36,136 34,039 37,909
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)