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Financial Risk Management - Additional Information (Detail) - USD ($) | 6 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Transfer between fair value hierarchy categories | $ 0 |  |
Commodity price risk [member] | Level 3 [member] | Shares and other investments available for sale and other derivative contracts [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Reasonable possible change in risk, percentage | 10.00% |  | 10.00%
Effect on equity and profit after taxation, due to reasonable possible change in risk | $ 45,000,000 |  | $ 50,000,000
Fixed interest rate not swapped to floating rate [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Borrowings | 3,019,000,000 | $ 3,019,000,000 |
Fixed interest rate not swapped to floating rate [member] | At fair value [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Borrowings | $ 3,366,000,000 | $ 3,434,000,000 |

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