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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 |
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Jun. 30, 2019 AUD ($) yr | Jun. 30, 2019 GBP (£) yr | Jun. 30, 2019 USD ($)
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 |  |  | $ 24.10
Estimated life of awards | yr | 3 | 3 |
Share price at grant date | $ 33.50 |  |
BHP Group Limited [member] | Long-Term Incentive Plan [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Weighted average fair value of awards granted during the year |  |  | 17.36
Risk-free interest rate | 2.04% | 2.04% |
Estimated life of awards | yr | 5 | 5 |
Share price at grant date | $ 33.50 |  |
Estimated volatility of share price | 30.00% | 30.00% |
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 |  |  | 21.29
Dividend yield | 5.30% | 5.30% |
BHP Group Limited [member] | MAP awards [member] | September 24, 2018 grant date [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Share price at grant date | $ 33.83 |  |
BHP Group Limited [member] | MAP awards [member] | November 12, 2018 grant date [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Share price at grant date | 33.41 |  |
BHP Group Limited [member] | MAP awards [member] | December 18, 2018 grant date [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Share price at grant date | $ 33.50 |  |
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] | Shareplus [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Weighted average fair value of awards granted during the year |  |  | 20.68
Risk-free interest rate | 2.13% | 2.13% |
Estimated life of awards | yr | 3 | 3 |
Share price at grant date | $ 28.29 |  |
Dividend yield | 4.71% | 4.71% |
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 |  |  | 18.68
Share price at grant date | £ |  | £ 16.71 |
Dividend yield | 5.80% | 5.80% |
BHP Group Plc [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 Plc [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 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 |  |  | $ 14.71
Risk-free interest rate | 0.86% | 0.86% |
Estimated life of awards | yr | 3 | 3 |
Share price at grant date | £ |  | £ 14.04 |
Dividend yield | 5.40% | 5.40% |

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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 2018-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_47_a_i&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_47_a_i&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_47_a_i&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + 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 2018-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_47_a_i&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 47 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_47_a&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_47_a_i&doctype=Standard -URIDate 2018-03-16 + Details
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