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Exceptional Items - Summary of Exceptional Items Related to the Samarco Dam Failure (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Disclosure of exceptional items [line items]      
Other income $ 394 $ 1,398 $ 380
Expenses excluding net finance costs:      
Expenses excluding net finance costs (31,873) (32,371) (30,871)
Profit/(loss) from equity accounted investments, related impairments and expenses:      
Samarco impairment expense (75) (515) (2,507)
Fair value change on forward exchange derivatives (135) 29 (87)
Net finance costs (1,531) (969) (1,223)
Income tax (expense)/benefit (7,077) (10,737) (10,616)
Total (606) (1,074) (5,480)
Samarco dam failure [member]      
Disclosure of exceptional items [line items]      
Other income     34
Expenses excluding net finance costs:      
Expenses excluding net finance costs (103) (66) (46)
Profit/(loss) from equity accounted investments, related impairments and expenses:      
Samarco impairment expense     (111)
Samarco dam failure provision (256) (595) (1,015)
Fair value change on forward exchange derivatives 471 (81) 136
Net finance costs (452) (290) (85)
Income tax (expense)/benefit 17 (31) (71)
Total $ (323) $ (1,063) $ (1,158)