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Financial Risk Management - Summary of Financial Assets and Liabilities by Class (Parenthetical) (Detail) - USD ($) $ in Millions | Jun. 30, 2018 | Jun. 30, 2017
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Disclosure of detailed information about financial instruments [Line Items] |  |
Other financial assets | $ 1,199 | $ 1,353
Input taxes receivable | 338 | 262
Input taxes payable | 189 | 134
Available for sale securities [member] | Level 3 [member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Other financial assets | 80 | 70
Other derivative contracts [member] | Cash flow hedges [member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Other financial assets and liabilities |  | 7
Other derivative contracts [member] | Level 3 [member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Other financial assets and liabilities | 213 | 365
Non-current available for sale shares and other investments [member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Other financial assets | 408 | 344
Non-current available for sale shares and other investments [member] | Available for sale securities [member] | Level 3 [member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Other financial assets | 80 | 70
US Treasury Notes [member] | Financial assets held at fair value through profit or loss [member] | Level 1 [member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Other financial assets | 108 | 97
BHP Billiton Foundation [member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Investments held which are restricted and not available for general use by the Group | $ 343 | $ 304

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