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Significant Events - Summary of Financial Impacts of Samarco Dam Failure (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Expenses excluding net finance costs:      
Costs incurred directly by BHP Brasil and other BHP entities in relation to the Samarco dam failure $ (36,750) $ (31,873) $ (32,371)
Profit/(loss) from equity accounted investments, related impairments and expenses:      
Fair value change on forward exchange derivatives (84) (135) 29
(Loss)/profit from operations (6,094) 112 (330)
Net finance costs (1,489) (1,531) (969)
Loss before taxation (6,600) (340) (620)
Income tax (expense)/benefit (6,447) (7,077) (10,737)
Loss after taxation (5,763) (606) (1,074)
Balance sheet movement      
Trade and other payables 27 1,086 (727)
Cash flow statement      
Loss before taxation (6,600) (340) (620)
Adjustments for:      
Fair value change on forward exchange derivatives 84 135 (29)
Proceeds of cash management related instruments 361 331 378
Net finance costs 1,489 1,531 969
Changes in assets and liabilities:      
Trade and other payables (27) (1,086) 727
Net operating cash flows 20,665 18,701 32,174
Net investing cash flows (8,762) (13,065) (6,959)
Samarco dam failure [member]      
Expenses excluding net finance costs:      
Costs incurred directly by BHP Brasil and other BHP entities in relation to the Samarco dam failure (139) (103) (66)
Profit/(loss) from equity accounted investments, related impairments and expenses:      
Samarco dam failure provision (2,833) (256) (595)
Fair value change on forward exchange derivatives (199) 471 (81)
(Loss)/profit from operations (3,171) 112 (742)
Net finance costs (506) (452) (290)
Loss before taxation (3,677) (340) (1,032)
Income tax (expense)/benefit (85) 17 (31)
Loss after taxation (3,762) (323) (1,063)
Balance sheet movement      
Other financial assets (280) 337 (160)
Trade and other payables (4) (6) (1)
Tax liabilities (85) 17 (31)
Provisions (2,824) (260) (629)
Net (increase)/decrease in liabilities (3,193) 88 (821)
Cash flow statement      
Loss before taxation (3,677) (340) (1,032)
Adjustments for:      
Samarco dam failure provision 2,833 256 595
Fair value change on forward exchange derivatives 199 (471) 81
Proceeds of cash management related instruments 218 134 79
Net finance costs 506 452 290
Changes in assets and liabilities:      
Trade and other payables 4 6 1
Net operating cash flows 83 37 14
Net investment and funding of equity accounted investments (640) (448) (256)
Net investing cash flows (640) (448) (256)
Net decrease in cash and cash equivalents $ (557) $ (411) $ (242)