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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, 2021
Jun. 30, 2020
Jun. 30, 2019
Earnings per share [line items]      
Earnings attributable to BHP shareholders $ 11,304 $ 7,956 $ 8,306
(Gain)/loss on sales of PP&E, Investments and Operations (50) 4 (52)
Impairments of property, plant and equipment, financial assets and intangibles 2,633 494 264
Impairment expense 2,635 494 264
Other    48  
Recycling of re-measurements from equity to the income statement     (6)
Tax effect of above adjustments (60) 54 (64)
Subtotal of adjustments 3,100 695 238
Headline earnings 14,404 8,651 8,544
Diluted headline earnings 14,404 8,651 8,544
Samarco dam failure [member]      
Earnings per share [line items]      
Impairment expense 111 $ 95 $ 96
Cerrejón [Member]      
Earnings per share [line items]      
Impairment expense $ 466