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Segment Reporting - Summary of Reportable Segments (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Disclosure of reportable segments [line items]      
Exceptional impairment losses $ 2,371 $ 409 $ 0
Exceptional items (4,385) (1,453) (952)
Other income 510 777 393
Group and unallocated items/eliminations [member]      
Disclosure of reportable segments [line items]      
Exceptional items (1,308) 413 19
Group and unallocated items/eliminations [member] | Samarco dam failure [member]      
Disclosure of reportable segments [line items]      
Exceptional items (14) (32) (31)
Other income $ 34 $ 489 $ 50