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Goodwill - Summary of Allocated goodwill (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of reconciliation of changes in goodwill [Line Items]
Goodwill	$ 1,037	$ 951	$ 892
Richards Bay Minerals [member]
Disclosure of reconciliation of changes in goodwill [Line Items]
Goodwill	552	502
Pilbara [member]
Disclosure of reconciliation of changes in goodwill [Line Items]
Goodwill	389	360
Dampier Salt [member]
Disclosure of reconciliation of changes in goodwill [Line Items]
Goodwill	$ 96	$ 89

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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.

+ References

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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