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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, 2018
Jun. 30, 2017
Jun. 30, 2016
Disclosure of significant subsidiaries [Line Items]      
Current assets $ 35,130 $ 21,056  
Non-current assets 76,863 95,950 $ 101,239
Current liabilities (13,989) (11,366)  
Non-current liabilities (37,334) (42,914)  
Net assets 60,670 62,726  
Net assets attributable to NCI 5,078 5,468  
Revenue 43,638 36,135 28,567
Profit after taxation 4,823 6,222 (6,207)
Other comprehensive income (97) (49) 23
Total comprehensive income 4,726 6,173 (6,184)
Profit after taxation attributable to NCI 1,118 332 178
Net operating cash flow 18,461 16,804 10,625
Net investing cash flow (5,921) (4,161) (7,245)
Net financing cash flow (10,891) (9,133) 284
Dividends paid to NCI $ 1,582 $ 575 $ 62
Minera Escondida Limitada [Member]      
Disclosure of significant subsidiaries [Line Items]      
Group share (per cent) 57.50% 57.50%  
Current assets $ 2,751 $ 2,107  
Non-current assets 13,389 14,528  
Current liabilities (1,781) (1,339)  
Non-current liabilities (4,352) (4,300)  
Net assets 10,007 10,996  
Net assets attributable to NCI 4,253 4,673  
Revenue 8,775 4,576  
Profit after taxation 2,221 516  
Other comprehensive income (2)    
Total comprehensive income 2,219 516  
Profit after taxation attributable to NCI 944 219  
Other comprehensive income attributable to NCI (1)    
Net operating cash flow 5,041 1,964  
Net investing cash flow (997) (999)  
Net financing cash flow (3,392) (968)  
Dividends paid to NCI 1,469 507  
Other individually immaterial subsidiaries [Member]      
Disclosure of significant subsidiaries [Line Items]      
Net assets attributable to NCI 825 795  
Profit after taxation attributable to NCI 174 113  
Other comprehensive income attributable to NCI 1    
Dividends paid to NCI 135 74  
Subsidiaries with material non-controlling interests [member]      
Disclosure of significant subsidiaries [Line Items]      
Net assets attributable to NCI 5,078 5,468  
Profit after taxation attributable to NCI 1,118 332  
Dividends paid to NCI $ 1,604 $ 581