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Significant Events - Summary of Financial Impacts of Samarco Dam Failure (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Income statement      
Other income $ 394 $ 1,398 $ 380
Expenses excluding net finance costs:      
Costs incurred directly by BHP Brasil and other BHP entities in relation to the Samarco dam failure (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)
Profit/(loss) from operations 112 (330) (4,338)
Net finance costs (1,531) (969) (1,223)
Loss before taxation (340) (620) (4,423)
Income tax benefit/(expense) (7,077) (10,737) (10,616)
Loss after taxation (606) (1,074) (5,480)
Balance sheet movement      
Trade and other payables 1,086 (727) (1,149)
Cash flow statement      
Loss before taxation (340) (620) (4,423)
Adjustments for:      
Samarco impairment expense 75 515 2,507
Fair value change on forward exchange derivatives 135 (29) 87
Proceeds of cash management related instruments 331 378 (401)
Net finance costs 1,531 969 1,223
Changes in assets and liabilities:      
Trade and other payables (1,086) 727 1,149
Net operating cash flows 18,701 32,174 27,234
Net investing cash flows (13,065) (6,959) (7,845)
Samarco dam failure [member]      
Income statement      
Other income     34
Expenses excluding net finance costs:      
Costs incurred directly by BHP Brasil and other BHP entities in relation to the Samarco dam failure (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
Profit/(loss) from operations 112 (742) (1,002)
Net finance costs (452) (290) (85)
Loss before taxation (340) (1,032) (1,087)
Income tax benefit/(expense) 17 (31) (71)
Loss after taxation (323) (1,063) (1,158)
Balance sheet movement      
Trade and other payables (6) (1) (5)
Derivatives 337 (160) 136
Tax liabilities 17 (31) (71)
Provisions (260) (629) (741)
Net decrease/(increase) in liabilities 88 (821) (681)
Cash flow statement      
Loss before taxation (340) (1,032) (1,087)
Adjustments for:      
Samarco impairment expense     111
Samarco dam failure provision 256 595 1,015
Fair value change on forward exchange derivatives (471) 81 (136)
Proceeds of cash management related instruments 134 79  
Net finance costs 452 290 85
Changes in assets and liabilities:      
Trade and other payables 6 1 5
Net operating cash flows 37 14 (7)
Net investment and funding of equity accounted investments (448) (256) (470)
Net investing cash flows (448) (256) (470)
Net decrease in cash and cash equivalents $ (411) $ (242) $ (477)