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Group statement of comprehensive income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017	[1]	Dec. 31, 2016
Statement Of Comprehensive Income [Abstract]
Currency translation charge	$ (382)	[1]	$ 310		$ (35)
Reclassification of cost of hedging to income statement and recognised within finance costs	$ 3
[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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- Definition

Reclassification of cost of hedging to income statement and recognised within finance costs.

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