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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, 2022
Jun. 30, 2021
Jun. 30, 2020
Disclosure of exceptional items [line items]      
Other income $ 1,398 $ 380 $ 720
Expenses excluding net finance costs:      
Expenses excluding net finance costs (32,371) (30,871) (25,453)
Loss from equity accounted investments, related impairments and expenses:      
Samarco impairment expense (515) (2,507) (482)
Fair value change on forward exchange derivatives 29 (87) (393)
Net finance costs (969) (1,223) (858)
Income tax expense (10,737) (10,616) (4,197)
Total (1,074) (5,480) (1,301)
Samarco dam failure [member]      
Disclosure of exceptional items [line items]      
Other income   34 489
Expenses excluding net finance costs:      
Expenses excluding net finance costs (66) (46) (64)
Loss from equity accounted investments, related impairments and expenses:      
Samarco impairment expense   (111) (95)
Samarco Germano dam decommissioning 68 (15) 46
Samarco dam failure provision (663) (1,000) (459)
Fair value change on forward exchange derivatives (81) 136  
Net finance costs (290) (85) (93)
Income tax expense (31) (71)  
Total $ (1,063) $ (1,158) $ (176)