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Events after the balance sheet date - Additional information (Detail) - USD ($) $ in Millions |  |  | 6 Months Ended
--- | --- | --- | ---
Aug. 01, 2018 | Jul. 12, 2018 | Jun. 30, 2018
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |
Proceeds from disposal |  |  | $ 150
Non Binding Agreement To Dispose Of Joint Operation [Member] |  |  |
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |
Sale of ownership consideration |  | $ 3,500 |
Other disposals of assets [member] | Queensland Australia [Member] |  |  |
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |
Proceeds from disposal | $ 3,950 |  |
Other disposals of assets [member] | Australia [Member] | Hail Creek Coal Mine And Valeria Coal Development Project [Member] | Glencore [Member] |  |  |
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |
Proceeds from sale of interests | 1,700 |  |
Other disposals of assets [member] | Australia [Member] | Kestrel Underground Coal Mine [Member] |  |  |
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |
Proceeds from sale of interests | $ 2,250 |  |

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