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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, 2020
Jun. 30, 2019
Jun. 30, 2018
Disclosure of significant subsidiaries [line items]      
Current assets $ 21,471 $ 23,373  
Non-current assets 83,312 77,488 $ 76,863
Current liabilities (14,824) (12,339)  
Non-current liabilities (37,713) (36,698)  
Net assets 52,246 51,824  
Net assets attributable to NCI 4,310 4,584  
Revenue 42,931 44,288 43,129
Profit after taxation 8,736 9,185 4,823
Other comprehensive income (69) (25) (97)
Total comprehensive income 8,667 9,160 4,726
Profit after taxation attributable to NCI 780 879 1,118
Net operating cash flow 15,706 17,871 18,461
Net investing cash flow (7,616) 2,607 (5,921)
Net financing cash flow $ (9,752) $ (20,528) $ (10,891)
Minera Escondida Limitada [member]      
Disclosure of significant subsidiaries [line items]      
Group share (per cent) 57.50% 57.50%  
Current assets $ 2,432 $ 2,456  
Non-current assets 12,121 12,538  
Current liabilities (1,614) (1,826)  
Non-current liabilities (4,613) (4,122)  
Net assets 8,326 9,046  
Net assets attributable to NCI 3,539 3,845  
Revenue 6,719 6,876  
Profit after taxation 1,088 1,360  
Other comprehensive income (27) (1)  
Total comprehensive income 1,061 1,359  
Profit after taxation attributable to NCI 462 578  
Other comprehensive income attributable to NCI (11)    
Net operating cash flow 2,637 3,283  
Net investing cash flow (919) (1,034)  
Net financing cash flow (1,920) (2,517)  
Dividends paid to NCI 757 986  
Other individually immaterial subsidiaries [member]      
Disclosure of significant subsidiaries [line items]      
Net assets attributable to NCI 771 739  
Profit after taxation attributable to NCI 318 301  
Other comprehensive income attributable to NCI   (1)  
Dividends paid to NCI 286 219  
Subsidiaries with material non-controlling interests [member]      
Disclosure of significant subsidiaries [line items]      
Net assets attributable to NCI 4,310 4,584  
Profit after taxation attributable to NCI 780 879  
Other comprehensive income attributable to NCI (11) (1)  
Dividends paid to NCI $ 1,043 $ 1,205