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Earnings Per Share - Summary of Reconciliation of Earnings Attributable to Ordinary Shareholders (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Earnings per share [line items]      
Earnings attributable to BHP shareholders $ 30,900 $ 11,304 $ 7,956
(Gain)/loss on sales of PP&E, Investments and Operations (95) (50) 4
Impairments of property, plant and equipment, financial assets and intangibles 515 2,633 494
Impairment expense 515 2,507 482
Exceptional items gross 620 4,423 1,540
Other     48
Tax effect of above adjustments (97) (60) 54
Subtotal of adjustments (8,684) 3,100 695
Headline earnings 22,216 14,404 8,651
Diluted headline earnings 22,216 14,404 8,651
Discontinued operations [member]      
Earnings per share [line items]      
Exceptional items gross (8,167) 47 6
Samarco dam failure [member]      
Earnings per share [line items]      
Impairment expense   111 95
Exceptional items gross 1,032 1,087 176
Cerrejón [Member]      
Earnings per share [line items]      
Impairment expense   466  
BHP Mitsui Coal (BMC) gain on disposal [Member]      
Earnings per share [line items]      
Exceptional items gross (840) $ 0 $ 0
Gain On Petroleum Disposal [Member] | Discontinued operations [member]      
Earnings per share [line items]      
Exceptional items gross $ (8,167)