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Goodwill - Summary of Allocated goodwill (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Disclosure of reconciliation of changes in goodwill [Line Items] |  |  |
Goodwill | $ 922 | $ 912 | $ 1,037
Richards Bay Minerals [Member] |  |  |
Disclosure of reconciliation of changes in goodwill [Line Items] |  |  |
Goodwill | 487 | 474 |
Pilbara [Member] |  |  |
Disclosure of reconciliation of changes in goodwill [Line Items] |  |  |
Goodwill | 349 | 351 |
Dampier Salt [Member] |  |  |
Disclosure of reconciliation of changes in goodwill [Line Items] |  |  |
Goodwill | $ 86 | $ 87 |

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