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Financial risk management and financial instruments - Derivatives Held for Trading (Details) R in Millions, $ in Millions | Jun. 30, 2018 USD ($) | Jun. 30, 2018 ZAR (R) | Jun. 30, 2017 USD ($) | Jun. 30, 2017 ZAR (R)
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Foreign exchange contracts and crude oil futures |  |  |  |
Financial risk management and financial instruments |  |  |  |
Fair value of assets |  | R 42 |  | R 56
Fair value of liabilities |  | (136) |  | (393)
Foreign exchange contracts |  |  |  |
Financial risk management and financial instruments |  |  |  |
Fair value of assets |  | 42 |  | 4
Fair value of liabilities |  | (45) |  | (393)
Contract/Notional amount | $ | $ 226 |  | $ 300 |
Crude oil futures |  |  |  |
Financial risk management and financial instruments |  |  |  |
Fair value of assets |  |  |  | 52
Fair value of liabilities |  | (91) |  |
Contract/Notional amount | $ 194 | R 2,792 | $ 123 | R 1,602

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- Definition The amount of derivative financial assets held for trading. [Refer: Derivative financial assets; Financial assets at fair value through profit or loss, classified as held for trading] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of derivative financial liabilities held for trading. [Refer: Derivative financial liabilities; Financial liabilities at fair value through profit or loss that meet definition of held for trading] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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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. + Details
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- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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