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Discontinued Operations - Additional Information (Detail) $ in Millions |  | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 28, 2018 USD ($) | Oct. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2018 USD ($)
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |
Total comprehensive income (loss) attributable to BHP shareholders |  |  | $ 3,713 | $ 2,049 | $ 3,608
Exceptional items net |  |  | $ (32) | 2,530 | 2,970
BHP Billiton Petroleum (Arkansas) Inc. [member] |  |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |
Percentage of issued share capital sold | 100.00% |  |  |  |
BHP Billiton Petroleum (Fayetteville) LLC [member] |  |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |
Percentage of issued share capital sold | 100.00% |  |  |  |
BHP Billiton Petroleum Arkansas and BHP Billiton Petroleum Fayetteville LLC [member] |  |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |
Agreement purchase price | $ 300 |  |  |  |
Petrohawk Energy Corporation [member] |  |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |
Percentage of issued share capital sold |  | 100.00% |  |  |
Agreement purchase price |  | $ 10,500 |  |  |
Customary completion adjustments |  | $ (200) |  |  |
Installment Number |  |  | 4 |  |
Proceeds from sale of subsidiary |  |  | $ 6,700 |  |
Net of transaction costs |  |  | 100 |  |
Deferred consideration |  |  | 3,500 |  |
Discontinued operations [member] |  |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |
Proceeds from sale of subsidiary |  |  | 7,028 |  |
Total comprehensive income (loss) attributable to BHP shareholders |  |  | (300) | 151 | (2,943)
Exceptional items net |  |  | $ 0 | $ (492) | $ 2,258

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