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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, 2020 | USD ($) yr £ / shares | USD ($) yr $ / shares
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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 | $ | $ 25.36 | $ 25.36
Estimated life of awards | 3 | 3
Share price at grant date | $ / shares |  | $ 37.24
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 | $ | $ 13.67 | $ 13.67
Risk-free interest rate | 0.78% | 0.78%
Estimated life of awards | 5 | 5
Share price at grant date | $ / shares |  | $ 37.24
Estimated volatility of share price | 22.00% | 22.00%
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 | $ | $ 21.46 | $ 21.46
Dividend yield | 5.30% | 5.30%
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 | 1 | 1
Share price at grant date | $ / shares |  | $ 36.53
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 | 5 | 5
Share price at grant date | $ / shares |  | $ 37.24
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 | $ | $ 19.03 | $ 19.03
Risk-free interest rate | 1.49% | 1.49%
Estimated life of awards | 3 | 3
Share price at grant date | $ / shares |  | $ 39.07
Dividend yield | 5.08% | 5.08%
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 | $ | $ 17.94 | $ 17.94
Estimated life of awards | 3 | 3
Share price at grant date | £ / shares | $ 17.33 |
Dividend yield | 6.00% | 6.00%
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 | $ | $ 12.17 | $ 12.17
Risk-free interest rate | 0.66% | 0.66%
Estimated life of awards | 3 | 3
Share price at grant date | £ / shares | $ 19.02 |
Dividend yield | 5.60% | 5.60%

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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 2019-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The option life of share options granted. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 47 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_47_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The weighted average share price used as input to the option pricing model to calculate the fair value of share options granted. [Refer: Option pricing model [member]; Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2019-03-27 + Details
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