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Significant Events - Summary of Financial Impacts of Samarco Dam Failure (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Income statement      
Other income $ 1,398 $ 380 $ 720
Expenses excluding net finance costs:      
Costs incurred directly by BHP Brasil and other BHP entities in relation to the Samarco dam failure (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)
Loss from operations (330) (4,338) (1,447)
Net finance costs (969) (1,223) (858)
Loss before taxation (620) (4,423) (1,540)
Income tax expense (10,737) (10,616) (4,197)
Loss after taxation (1,074) (5,480) (1,301)
Balance sheet movement      
Trade and other payables (727) (1,149) 589
Cash flow statement      
Loss before taxation (620) (4,423) (1,540)
Adjustments for:      
Samarco impairment expense 515 2,507 482
Fair value change on forward exchange derivatives (29) 87 393
Proceeds of cash management related instruments 378 (401) 85
Net finance costs 969 1,223 858
Changes in assets and liabilities:      
Trade and other payables 727 1,149 (589)
Net operating cash flows 32,174 27,234 15,706
Net investing cash flows (6,959) (7,845) (7,616)
Samarco dam failure [member]      
Income statement      
Other income   34 489
Expenses excluding net finance costs:      
Costs incurred directly by BHP Brasil and other BHP entities in relation to the Samarco dam failure (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  
Loss from operations (742) (1,002) (83)
Net finance costs (290) (85) (93)
Loss before taxation (1,032) (1,087) (176)
Income tax expense (31) (71)  
Loss after taxation (1,063) (1,158) (176)
Balance sheet movement      
Trade and other payables (1) (5) (5)
Derivatives (160) 136  
Tax liabilities (31) (71)  
Provisions (629) (741) (137)
Net liabilities (821) (681) (142)
Cash flow statement      
Loss before taxation (1,032) (1,087) (176)
Adjustments for:      
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)  
Proceeds of cash management related instruments 79    
Net finance costs 290 85 93
Changes in assets and liabilities:      
Trade and other payables 1 5 5
Net operating cash flows 14 (7) 430
Net investment and funding of equity accounted investments (256) (470) (464)
Net investing cash flows (256) (470) (464)
Net decrease in cash and cash equivalents $ (242) $ (477) $ (34)