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Exceptional Items - Summary of Exceptional Items by Category (Detail) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2019
Disclosure of exceptional items [line items] |  |  |  |
Exceptional items gross | $ (784) |  | $ (210) | $ (1,060)
Exceptional items tax | 271 |  | 242 | 242
Exceptional items net | (513) |  | 32 | (818)
Samarco dam failure [member] |  |  |  |
Disclosure of exceptional items [line items] |  |  |  |
Exceptional items gross | (6) | [1] | (210) | (1,060)
Exceptional items tax | 0 |  |  |
Exceptional items net | (6) |  | (210) | (1,060)
Cancellation Of Power Contracts [Member] |  |  |  |
Disclosure of exceptional items [line items] |  |  |  |
Exceptional items gross | (778) |  |  |
Exceptional items tax | 271 |  |  |
Exceptional items net | (507) |  |  |
Global taxation matters [member] |  |  |  |
Disclosure of exceptional items [line items] |  |  |  |
Exceptional items tax |  |  | 242 | 242
Exceptional items net |  |  | 242 | 242
Non-controlling interests [member] |  |  |  |
Disclosure of exceptional items [line items] |  |  |  |
Exceptional items gross | (282) |  |  | 0
Exceptional items tax | 87 |  |  | 0
Exceptional items net | (195) |  |  | 0
Attributable to BHP shareholders [member] |  |  |  |
Disclosure of exceptional items [line items] |  |  |  |
Exceptional items gross | (502) |  | (210) | (1,060)
Exceptional items tax | 184 |  | 242 | 242
Exceptional items net | $ (318) |  | $ 32 | $ (818)
[1] | Refer to note 9 Significant events – Samarco dam failure for further information.

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