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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, 2021
Jun. 30, 2020
Jun. 30, 2019
Disclosure of significant subsidiaries [line items]      
Current assets $ 26,693 $ 21,471  
Non-current assets 82,234 84,262  
Current liabilities (16,403) (14,824)  
Non-current liabilities (36,919) (38,734)  
Net assets 55,605 52,175  
Net assets attributable to NCI 4,341 4,310  
Revenue 60,817 42,931 $ 44,288
Profit after taxation 13,451 8,736 9,185
Other comprehensive income 59 (69) (25)
Total comprehensive income 13,510 8,667 9,160
Profit after taxation attributable to NCI 2,147 780 879
Net operating cash flow 27,234 15,706 17,871
Net investing cash flow (7,845) (7,616) 2,607
Net financing cash flow $ (17,922) $ (9,752) $ (20,528)
Minera Escondida Limitada [member]      
Disclosure of significant subsidiaries [line items]      
Group share (per cent) 57.50% 57.50%  
Current assets $ 2,996 $ 2,432  
Non-current assets 11,867 12,121  
Current liabilities (1,912) (1,614)  
Non-current liabilities (4,733) (4,613)  
Net assets 8,218 8,326  
Net assets attributable to NCI 3,493 3,539  
Revenue 9,470 6,719  
Profit after taxation 3,605 1,088  
Other comprehensive income 27 (27)  
Total comprehensive income 3,632 1,061  
Profit after taxation attributable to NCI 1,532 462  
Other comprehensive income attributable to NCI 11 (11)  
Net operating cash flow 5,007 2,637  
Net investing cash flow (655) (919)  
Net financing cash flow (4,001) (1,920)  
Dividends paid to NCI 1,590 757  
Other individually immaterial subsidiaries [member]      
Disclosure of significant subsidiaries [line items]      
Net assets attributable to NCI 848 771  
Profit after taxation attributable to NCI 615 318  
Dividends paid to NCI 537 286  
Subsidiaries with material non-controlling interests [member]      
Disclosure of significant subsidiaries [line items]      
Net assets attributable to NCI 4,341 4,310  
Profit after taxation attributable to NCI 2,147 780  
Other comprehensive income attributable to NCI 11 (11)  
Dividends paid to NCI $ 2,127 $ 1,043