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Employee Share Ownership Plans - Summary of Fair Value and Assumptions in the Calculation of Fair Value for Awards Issued (Detail) - 12 months ended Jun. 30, 2021 | USD ($) yr $ / shares | USD ($) yr £ / shares
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BHP Group Limited [member] | CDP awards [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Weighted average fair value of awards granted during the year | $ | $ 25.28 | $ 25.28
Share price at grant date | $ 35.90 |
BHP Group Limited [member] | CDP awards [Member] | Bottom of range [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Estimated life of awards | yr | 2 | 2
BHP Group Limited [member] | CDP awards [Member] | Top of range [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Estimated life of awards | yr | 5 | 5
BHP Group Limited [member] | STIP awards [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Weighted average fair value of awards granted during the year | $ | $ 25.28 | $ 25.28
Estimated life of awards | yr | 2 | 2
Share price at grant date | $ 35.90 |
BHP Group Limited [member] | LTIP awards [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Weighted average fair value of awards granted during the year | $ | $ 14.68 | $ 14.68
Risk-free interest rate | 0.25% | 0.25%
Estimated life of awards | yr | 5 | 5
Estimated volatility of share price | 28.00% | 28.00%
BHP Group Limited [member] | LTIP awards [member] | Range One [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Share price at grant date | $ 35.90 |
BHP Group Limited [member] | LTIP awards [member] | Range Two [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Share price at grant date | 33.81 |
BHP Group Limited [member] | LTIP awards [member] | Range Three [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Share price at grant date | $ 38.56 |
BHP Group Limited [member] | MAP awards [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Weighted average fair value of awards granted during the year | $ | $ 22.88 | $ 22.88
Dividend yield | 4.90% | 4.90%
BHP Group Limited [member] | MAP awards [member] | Bottom of range [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Estimated life of awards | yr | 1 | 1
BHP Group Limited [member] | MAP awards [member] | Top of range [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Estimated life of awards | yr | 5 | 5
BHP Group Limited [member] | MAP awards [member] | Range One [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Share price at grant date | $ 38.36 |
BHP Group Limited [member] | MAP awards [member] | Range Two [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Share price at grant date | 36.91 |
BHP Group Limited [member] | MAP awards [member] | Range Three [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Share price at grant date | 35.90 |
BHP Group Limited [member] | MAP awards [member] | Range Four [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Share price at grant date | $ 45.88 |
BHP Group Limited [member] | Shareplus [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Weighted average fair value of awards granted during the year | $ | $ 24.96 | $ 24.96
Risk-free interest rate | 0.21% | 0.21%
Estimated life of awards | yr | 3 | 3
Share price at grant date | $ 30.19 |
Dividend yield | 5.59% | 5.59%
BHP Group Limited [member] | Transitional and Commencement KMP awards [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Weighted average fair value of awards granted during the year | $ | $ 28.35 | $ 28.35
Estimated life of awards | yr | 2 | 2
Share price at grant date | $ 38.56 |
BHP Group Plc [member] | MAP awards [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Weighted average fair value of awards granted during the year | $ | $ 18.66 | $ 18.66
Estimated life of awards | yr | 3 | 3
Share price at grant date | £ / shares |  | $ 17.13
Dividend yield | 5.70% | 5.70%
BHP Group Plc [member] | Shareplus [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Weighted average fair value of awards granted during the year | $ | $ 15.32 | $ 15.32
Risk-free interest rate | 0.12% | 0.12%
Estimated life of awards | yr | 3 | 3
Share price at grant date | £ / shares |  | $ 12.11
Dividend yield | 6.40% | 6.40%

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- Definition The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The percentage of an expected dividend used to calculate the fair value of share options granted. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The weighted average fair value of share options granted during the period at the measurement date. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_47_a&doctype=Standard -URIDate 2020-01-01 + Details
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