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Goodwill - Summary of Allocated goodwill (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of reconciliation of changes in goodwill [Line Items]
Goodwill	$ 946	$ 922	$ 912
Richards Bay Minerals
Disclosure of reconciliation of changes in goodwill [Line Items]
Goodwill	468	487
Pilbara
Disclosure of reconciliation of changes in goodwill [Line Items]
Goodwill	383	349
Dampier Salt
Disclosure of reconciliation of changes in goodwill [Line Items]
Goodwill	$ 95	$ 86

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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No definition available.

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- Definition

The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Business combinations [member]]

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