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Significant Events - Summary of Financial Impacts of Samarco Dam Failure (Detail) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Jun. 30, 2022
Income statement      
Other income $ 269 $ 414 $ 1,398
Expenses excluding net finance costs:      
Costs incurred directly by BHP Brasil and other BHP entities in relation to the Samarco dam failure (15,429) (15,742) (32,371)
Profit/(loss) from equity accounted investments, related impairments and expenses:      
Samarco impairment expense (21) (38) (515)
Net finance costs (652) (352) (969)
Loss before taxation (142) (822) (620)
Income tax benefit/(expense) (3,055) (4,959) (10,737)
Loss after taxation (140) (1,244) (1,074)
Balance sheet movement      
Trade and other payables 1,598 1,193 (727)
Cash flow statement      
Loss before taxation (142) (822) (620)
Adjustments for:      
Samarco impairment expense 21 38 515
Proceeds/(settlements) of cash management related instruments 274 33 378
Net finance costs 652 352 969
Changes in assets and liabilities:      
Trade and other payables (1,598) (1,193) 727
Net operating cash flows 6,770 13,277 32,174
Net investing cash flows (3,289) (3,589) (6,959)
Samarco dam failure [member]      
Income statement      
Other income    
Expenses excluding net finance costs:      
Costs incurred directly by BHP Brasil and other BHP entities in relation to the Samarco dam failure (47) (27) (66)
Profit/(loss) from equity accounted investments, related impairments and expenses:      
Samarco impairment expense    
Samarco Germano dam decommissioning 31 49 68
Samarco dam failure provision (13) (539) (663)
Fair value change on forward exchange derivatives 109 (212) (81)
Profit/(loss) from operations 80 (729) (742)
Net finance costs (222) (93) (290)
Loss before taxation (142) (822) (1,032)
Income tax benefit/(expense) 2 1 (31)
Loss after taxation (140) (821) (1,063)
Balance sheet movement      
Trade and other payables 3 (1)
Derivatives 83 (202) (160)
Tax liabilities 2 1 (31)
Provisions 135 (327) (629)
Net liabilities 220 (525) (821)
Cash flow statement      
Loss before taxation (142) (822) (1,032)
Adjustments for:      
Samarco impairment expense    
Samarco Germano dam decommissioning (31) (49) (68)
Samarco dam failure provision 13 539 663
Fair value change on forward exchange derivatives (109) 212 81
Proceeds/(settlements) of cash management related instruments 26 (10) 79
Net finance costs 222 93 290
Changes in assets and liabilities:      
Trade and other payables (3) 1
Net operating cash flows (21) (40) 14
Net investment and funding of equity accounted investments (339) (256) (256)
Net investing cash flows (339) (256) (256)
Net decrease in cash and cash equivalents $ (360) $ (296) $ (242)