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 | ||