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Group statement of comprehensive income (Parenthetical) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement Of Comprehensive Income [Abstract]
Currency translation charge	[1]	$ 310	$ (35)	$ (503)
[1] Refer to note 1(d).

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- Definition

Represents the amount of exchange differences arising on the translation of the net assets of entities with functional currencies other than the US dollar are recognised directly in the currency translation reserve. These translation differences are shown in the statement of comprehensive income, with the exception of translation adjustments relating to Rio Tinto Limited’s share capital which are shown in the statement of changes in equity.

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Balance Type:	debit
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