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Acquisitions and disposals - Additional information (Detail) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019
Disclosure Of Acquisitions And Disposals [Line Items] |  |  |
Disposals of subsidiaries, joint ventures, unincorporated joint operations and associates | [1] |  | $ 46
Yancoal |  |  |
Disclosure Of Acquisitions And Disposals [Line Items] |  |  |
Disposals of subsidiaries, joint ventures, unincorporated joint operations and associates | [1] | $ 10 |
Royalty proceeds |  |  | 20
Hail Creek Coal Mine |  |  |
Disclosure Of Acquisitions And Disposals [Line Items] |  |  |
Cash received from working capital adjustments |  |  | $ 26
[1] | Refer to Acquisitions and disposals note on page F-14.

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