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Basis of preparation - Standards applied (Details) - ZAR (R) R in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2018
Disclosure of initial application of standards or interpretations |  |  |  |
Property, plant and equipment and assets under construction |  | R 365,559 |  |
Finance costs | [1] | (252) | R (1,689) | R (3,759)
Pro forma results before amendment |  |  |  |
Disclosure of initial application of standards or interpretations |  |  |  |
Property, plant and equipment and assets under construction |  | 364,610 |  |
Finance costs |  | (1,201) |  |
Adjustment on adoption of IAS 23 amendment |  |  |  |
Disclosure of initial application of standards or interpretations |  |  |  |
Property, plant and equipment and assets under construction |  | 949 |  |
Finance costs |  | R 949 |  |
[1] | Finance costs decreased mainly due to the adoption of the amendment to IAS 23 'Borrowing Costs' on 1 July 2018, which resulted in a higher capitalisation of costs.

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- Definition The amount of costs associated with financing activities of the entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 82 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_82_b&doctype=Standard -URIDate 2018-03-16 + Details
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