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Employee Share Ownership Plans - Summary of Employee Share Awards (Detail) - 12 months ended Jun. 30, 2020 | shares yr £ / shares | shares 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] |  |
Number of awards at the beginning of the financial year | 513,991 | 513,991
Number of awards issued during the year | 157,865 | 157,865
Number of awards vested and exercised | 294,713 | 294,713
Number of awards lapsed | 3 | 3
Number of awards at the end of the financial year | 377,140 | 377,140
Weighted average remaining contractual life (years) | yr | 0.5 | 0.5
Weighted average share price at exercise date | $ / shares |  | $ 35.33
BHP Group Limited [Member] | GSTIP awards [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of awards at the beginning of the financial year | 1,142,484 | 1,142,484
Number of awards vested and exercised | 1,130,443 | 1,130,443
Number of awards at the end of the financial year | 12,041 | 12,041
Weighted average remaining contractual life (years) | yr | 0.2 | 0.2
Weighted average share price at exercise date | $ / shares |  | $ 35.51
BHP Group Limited [Member] | LTIP awards [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of awards at the beginning of the financial year | 5,730,889 | 5,730,889
Number of awards issued during the year | 809,055 | 809,055
Number of awards lapsed | 1,602,438 | 1,602,438
Number of awards at the end of the financial year | 4,937,506 | 4,937,506
Weighted average remaining contractual life (years) | yr | 1.7 | 1.7
BHP Group Limited [Member] | Transitional OMC awards [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of awards at the beginning of the financial year | 23,420 | 23,420
Number of awards vested and exercised | 19,439 | 19,439
Number of awards lapsed | 3,981 | 3,981
Weighted average share price at exercise date | $ / shares |  | $ 35.25
BHP Group Limited [Member] | MAP awards [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of awards at the beginning of the financial year | 11,490,345 | 11,490,345
Number of awards issued during the year | 3,898,575 | 3,898,575
Number of awards vested and exercised | 3,465,901 | 3,465,901
Number of awards lapsed | 763,029 | 763,029
Number of awards at the end of the financial year | 11,159,990 | 11,159,990
Number of awards vested and exercisable at the end of the financial year | 25,549 | 25,549
Weighted average remaining contractual life (years) | yr | 1.2 | 1.2
Weighted average share price at exercise date | $ / shares |  | $ 35.62
BHP Group Limited [Member] | Shareplus [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of awards at the beginning of the financial year | 3,857,145 | 3,857,145
Number of awards issued during the year | 2,483,483 | 2,483,483
Number of awards vested and exercised | 1,985,787 | 1,985,787
Number of awards lapsed | 297,459 | 297,459
Number of awards at the end of the financial year | 4,057,382 | 4,057,382
Weighted average remaining contractual life (years) | yr | 1.3 | 1.3
Weighted average share price at exercise date | $ / shares |  | $ 32.16
BHP Group Plc [member] | GSTIP awards [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of awards at the beginning of the financial year | 29,426 | 29,426
Number of awards vested and exercised | 29,426 | 29,426
Weighted average share price at exercise date | £ / shares | £ 17.14 |
BHP Group Plc [member] | MAP awards [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of awards at the beginning of the financial year | 273,031 | 273,031
Number of awards issued during the year | 80,033 | 80,033
Number of awards vested and exercised | 76,267 | 76,267
Number of awards lapsed | 58,394 | 58,394
Number of awards at the end of the financial year | 218,403 | 218,403
Weighted average remaining contractual life (years) | yr | 1.1 | 1.1
Weighted average share price at exercise date | £ / shares | £ 17.14 |
BHP Group Plc [member] | Shareplus [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of awards at the beginning of the financial year | 224,070 | 224,070
Number of awards issued during the year | 142,168 | 142,168
Number of awards vested and exercised | 116,005 | 116,005
Number of awards lapsed | 20,771 | 20,771
Number of awards at the end of the financial year | 229,462 | 229,462
Weighted average remaining contractual life (years) | yr | 1.3 | 1.3
Weighted average share price at exercise date | £ / shares | £ 12.96 |

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