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Significant Events - Summary of Financial Impacts of Samarco Dam Failure (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Income statement      
Other income $ 510 $ 777 $ 393
Expenses excluding net finance costs:      
Costs incurred directly by BHP Brasil and other BHP entities in relation to the Samarco dam failure (34,500) (28,775) (28,022)
Loss from equity accounted investments, related impairments and expenses:      
Samarco impairment expense (2,635) (494) (264)
Fair value change on forward exchange derivatives (145) (422) (8)
Loss from operations (4,385) (1,453) (952)
Net finance costs (1,305) (911) (1,064)
Loss before taxation (4,470) (1,546) (1,060)
Income tax expense (11,150) (4,774) (5,529)
Loss after taxation (5,797) (1,305) (818)
Balance sheet movement      
Trade and other payables (1,201) 755 (406)
Cash flow statement      
Loss before taxation (4,470) (1,546) (1,060)
Adjustments for:      
Samarco impairment expense 2,635 494 264
Fair value change on forward exchange derivatives 145 422 8
Net finance costs 1,305 911 1,064
Changes in assets and liabilities:      
Trade and other payables 1,201 (755) 406
Net operating cash flows 27,234 15,706 17,871
Net investing cash flows (7,845) (7,616) 2,607
Samarco dam failure [member]      
Income statement      
Other income 34 489 50
Expenses excluding net finance costs:      
Costs incurred directly by BHP Brasil and other BHP entities in relation to the Samarco dam failure (46) (64) (57)
Loss from equity accounted investments, related impairments and expenses:      
Samarco impairment expense (111) (95) (96)
Samarco Germano dam decommissioning (15) 46 (263)
Samarco dam failure provision (1,000) (459) (586)
Fair value change on forward exchange derivatives 136    
Loss from operations (1,002) (83) (952)
Net finance costs (85) (93) (108)
Loss before taxation (1,087) (176) (1,060)
Income tax expense (71)    
Loss after taxation (1,158) (176) (1,060)
Balance sheet movement      
Trade and other payables (5) (5) 4
Derivatives 136    
Tax liabilities (71)    
Provisions (741) (137) (629)
Net liabilities (681) (142) (625)
Cash flow statement      
Loss before taxation (1,087) (176) (1,060)
Adjustments for:      
Samarco impairment expense 111 95 96
Samarco Germano dam decommissioning 15 (46) 263
Samarco dam failure provision 1,000 459 586
Fair value change on forward exchange derivatives (136)    
Net finance costs 85 93 108
Changes in assets and liabilities:      
Trade and other payables 5 5 (4)
Net operating cash flows (7) 430 (11)
Net investment and funding of equity accounted investments (470) (464) (424)
Net investing cash flows (470) (464) (424)
Net decrease in cash and cash equivalents $ (477) $ (34) $ (435)