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Employee Share Ownership Plans - Summary of Employee Share Awards (Detail) | 12 Months Ended
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Jun. 30, 2018 shares yr
BHP Billiton 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 | 497,634
Number of awards issued during the year | 274,743
Number of awards vested and exercised | 464,349
Number of awards at the end of the financial year | 308,028
Weighted average remaining contractual life (years) | yr | 1.0
BHP Billiton 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 | 2,001,583
Number of awards issued during the year | 1,422,338
Number of awards vested and exercised | 1,383,656
Number of awards lapsed | 31,810
Number of awards at the end of the financial year | 2,008,455
Number of awards vested and exercisable at the end of the financial year | 28,981
Weighted average remaining contractual life (years) | yr | 0.8
BHP Billiton Limited [Member] | Long-Term Incentive Plan [member] |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |
Number of awards at the beginning of the financial year | 4,679,513
Number of awards issued during the year | 1,523,309
Number of awards vested and exercised | 65,247
Number of awards lapsed | 156,600
Number of awards at the end of the financial year | 5,980,975
Weighted average remaining contractual life (years) | yr | 2.5
BHP Billiton 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 | 137,194
Number of awards vested and exercised | 61,485
Number of awards lapsed | 28,869
Number of awards at the end of the financial year | 46,840
Weighted average remaining contractual life (years) | yr | 0.7
BHP Billiton 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 | 7,348,428
Number of awards issued during the year | 5,731,891
Number of awards vested and exercised | 2,185,614
Number of awards lapsed | 515,442
Number of awards at the end of the financial year | 10,379,263
Number of awards vested and exercisable at the end of the financial year | 60,134
Weighted average remaining contractual life (years) | yr | 1.5
BHP Billiton 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 | 5,998,517
Number of awards issued during the year | 2,483,091
Number of awards vested and exercised | 3,184,545
Number of awards lapsed | 521,984
Number of awards at the end of the financial year | 4,775,079
Weighted average remaining contractual life (years) | yr | 1.2
BHP Billiton Limited [Member] | Employee Share Plan shares (legacy plan) [member] |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |
Number of awards at the beginning of the financial year | 338,883
Number of awards vested and exercised | 338,883
BHP Billiton 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 | 84,250
Number of awards issued during the year | 40,957
Number of awards vested and exercised | 59,577
Number of awards lapsed | 1,762
Number of awards at the end of the financial year | 63,868
Weighted average remaining contractual life (years) | yr | 0.8
BHP Billiton Plc [Member] | Long-Term Incentive Plan [member] |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |
Number of awards at the beginning of the financial year | 386,912
Number of awards vested and exercised | 74,988
Number of awards lapsed | 311,924
BHP Billiton 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 | 596,443
Number of awards issued during the year | 133,926
Number of awards vested and exercised | 406,783
Number of awards lapsed | 8,135
Number of awards at the end of the financial year | 315,451
Weighted average remaining contractual life (years) | yr | 1.3
BHP Billiton 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 | 336,108
Number of awards issued during the year | 137,832
Number of awards vested and exercised | 165,450
Number of awards lapsed | 26,331
Number of awards at the end of the financial year | 282,159
Weighted average remaining contractual life (years) | yr | 1.2

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