Dividends (Details) $ / shares in Units, $ in Millions				12 Months Ended
Feb. 19, 2019 $ / shares	Feb. 19, 2019 R / shares	Feb. 20, 2018 $ / shares	Feb. 20, 2018 R / shares	Feb. 21, 2017 $ / shares	Feb. 21, 2017 R / shares	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Disclosure of share capital, reserves and other equity interest [Abstract]
Dividends declared (in dollars per share) \| (per share)	$ 0.07	R 0.95	$ 0.06	R 0.70	$ 0.1	R 1.30
Dividends paid							$ 27	$ 24	$ 39

Disclosure of share capital, reserves and other equity interest [Abstract]

No definition available.

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- Definition

The amount of dividends paid by the entity on ordinary shares. [Refer: Ordinary shares [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 34
-IssueDate 2018-01-01
-Paragraph 16A
-Subparagraph f
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=34&date=2018-03-01&anchor=para_16A_f&doctype=Standard
-URIDate 2018-03-16

+ Details

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- Definition

The amount, per share, of dividends proposed or declared before financial statements were authorised for issue but not recognised as distribution to owners.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 137
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_137_a&doctype=Standard
-URIDate 2018-03-16

+ Details

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