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Other Equity - Summary of Financial Information Relating to Subsidiaries with Non-controlling Interests (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Disclosure of significant subsidiaries [line items]      
Current assets $ 23,373 $ 35,130  
Non-current assets 77,488 76,863 $ 95,950
Current liabilities (12,339) (13,989)  
Non-current liabilities (36,698) (37,334)  
Net assets 51,824 60,670  
Net assets attributable to NCI 4,584 5,078  
Revenue 44,288 43,129 35,740
Profit after taxation 9,185 4,823 6,222
Other comprehensive income (25) (97) (49)
Total comprehensive income 9,160 4,726 6,173
Profit after taxation attributable to NCI 879 1,118 332
Net operating cash flow 17,871 18,461 16,804
Net investing cash flow 2,607 (5,921) (4,161)
Net financing cash flow $ (20,528) $ (10,891) $ (9,133)
Minera Escondida Limitada [member]      
Disclosure of significant subsidiaries [line items]      
Group share (per cent) 57.50% 57.50%  
Current assets $ 2,456 $ 2,751  
Non-current assets 12,538 13,389  
Current liabilities (1,826) (1,781)  
Non-current liabilities (4,122) (4,352)  
Net assets 9,046 10,007  
Net assets attributable to NCI 3,845 4,253  
Revenue 6,876 8,775  
Profit after taxation 1,360 2,221  
Other comprehensive income (1) (2)  
Total comprehensive income 1,359 2,219  
Profit after taxation attributable to NCI 578 944  
Other comprehensive income attributable to NCI   (1)  
Net operating cash flow 3,283 5,041  
Net investing cash flow (1,034) (997)  
Net financing cash flow (2,517) (3,392)  
Dividends paid to NCI 986 1,469  
Other individually immaterial subsidiaries [member]      
Disclosure of significant subsidiaries [line items]      
Net assets attributable to NCI 739 825  
Profit after taxation attributable to NCI 301 174  
Other comprehensive income attributable to NCI (1) 1  
Dividends paid to NCI 219 135  
Subsidiaries with material non-controlling interests [member]      
Disclosure of significant subsidiaries [line items]      
Net assets attributable to NCI 4,584 5,078  
Profit after taxation attributable to NCI 879 1,118  
Other comprehensive income attributable to NCI (1)    
Dividends paid to NCI $ 1,205 $ 1,604