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Investments Accounted for Using the Equity Method - Summary of Financial Information of Significant Equity Accounted Investments (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Disclosure of significant investments in associates and joint ventures [line items]      
Carrying amount of investments accounted for using the equity method $ 1,620 $ 1,420 $ 1,742
Impairment of the carrying value of the investment (75) (515) (2,507)
Fair value change on forward exchange derivatives (135) 29 (87)
Profit/(loss) from equity accounted investments, related impairments and expenses 594 (19) (915)
Dividends received from equity accounted investments 328    
Compania Minera Antamina S.A. [member]      
Disclosure of significant investments in associates and joint ventures [line items]      
Current assets 1,519 1,275  
Non-current assets 5,670 5,293  
Current liabilities (774) (847)  
Non-current liabilities (1,944) (1,851)  
Net assets/(liabilities) - 100% 4,471 3,870  
Net assets/(liabilities) - Group share 1,509 1,306  
Adjustments to net assets related to accounting policy adjustments (79)    
Carrying amount of investments accounted for using the equity method 1,430 1,306  
Revenue - 100% 4,350 5,264 4,822
Profit/(loss) from Continuing operations - 100% 1,571 2,133 1,847
Share of profit/(loss) of equity accounted investments 530 720 623
Adjustments to share of profit/(loss) related to accounting policy adjustments (79)    
Profit/(loss) from equity accounted investments, related impairments and expenses 451 720 623
Comprehensive income/(loss) - 100% 1,571 2,133 1,847
Share of comprehensive income/(loss) - Group share in equity accounted investments 451 720 623
Dividends received from equity accounted investments 327 776 714
Carbonesdel Cerrejon Limited Liability Corporation [Member]      
Disclosure of significant investments in associates and joint ventures [line items]      
Revenue - 100%     844
Profit/(loss) from Continuing operations - 100%     (43)
Share of profit/(loss) of equity accounted investments     (14)
Impairment of the carrying value of the investment     (466)
Profit/(loss) from equity accounted investments, related impairments and expenses     (480)
Comprehensive income/(loss) - 100%     (43)
Share of comprehensive income/(loss) - Group share in equity accounted investments     (480)
Dividends received from equity accounted investments     13
Individually immaterial, associates [member]      
Disclosure of significant investments in associates and joint ventures [line items]      
Carrying amount of investments accounted for using the equity method 190 114  
Profit/(loss) from equity accounted investments, related impairments and expenses (72) (63) (68)
Share of comprehensive income/(loss) - Group share in equity accounted investments (72) (63) (68)
Dividends received from equity accounted investments 1 11 10
Samarco Mineracao S.A. [member]      
Disclosure of significant investments in associates and joint ventures [line items]      
Current assets 537 499  
Non-current assets 5,739 5,717  
Current liabilities (11,167) (10,830)  
Non-current liabilities (10,614) (7,873)  
Net assets/(liabilities) - 100% (15,505) (12,487)  
Net assets/(liabilities) - Group share (7,753) (6,244)  
Adjustments to net assets related to accounting policy adjustments 291 268  
Investment in Samarco 516 516  
Impairment of the carrying value of the investment in Samarco (1,041) (1,041)  
Additional share of Samarco losses 6,034 5,326  
Unrecognised losses 1,953 1,175  
Revenue - 100% 1,554 1,670 814
Profit/(loss) from Continuing operations - 100% (3,018) (528) (2,202)
Share of profit/(loss) of equity accounted investments (1,509) (276) (1,076)
Adjustments to share of profit/(loss) related to accounting policy adjustments 23    
Impairment of the carrying value of the investment     (111)
Additional share of Samarco losses 452 290 85
Fair value change on forward exchange derivatives 471 (81) 136
Unrecognised losses 778 (609) (24)
Profit/(loss) from equity accounted investments, related impairments and expenses 215 (676) (990)
Comprehensive income/(loss) - 100% (3,018) (528) (2,202)
Share of comprehensive income/(loss) - Group share in equity accounted investments 215 (676) (990)
Investments accounted for using equity method [member]      
Disclosure of significant investments in associates and joint ventures [line items]      
Carrying amount of investments accounted for using the equity method 1,620 1,420  
Profit/(loss) from equity accounted investments, related impairments and expenses 594 (19) (915)
Share of comprehensive income/(loss) - Group share in equity accounted investments 594 (19) (915)
Dividends received from equity accounted investments $ 328 $ 787 $ 737