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Segment Reporting - Summary of Reportable Segments (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Disclosure of reportable segments [line items]      
Exceptional impairment losses $ 0 $ 0 $ 2,371
Exceptional items (31,873) (32,371) (30,871)
Other income 394 1,398 380
Fair value changes on forward exchange derivatives (135) 29 (87)
Samarco dam failure [member]      
Disclosure of reportable segments [line items]      
Exceptional items (103) (66) (46)
Other income     34
Fair value changes on forward exchange derivatives 471 (81) 136
Operating segments [member] | Samarco dam failure [member] | Copper [Member]      
Disclosure of reportable segments [line items]      
Fair value changes on forward exchange derivatives 471 (81) 136
Group and unallocated items/eliminations [member] | Samarco dam failure [member]      
Disclosure of reportable segments [line items]      
Exceptional items (64) (13) (14)
Other income $ 0 $ 0 $ 34