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Financial risk management and financial instruments - Derivatives Designated in Hedge Relationships (Details) - Interest rate swaps R in Millions, $ in Millions	Jun. 30, 2019 USD ($)	Jun. 30, 2019 ZAR (R)	Jun. 30, 2018 USD ($)	Jun. 30, 2018 ZAR (R)	Dec. 31, 2015 USD ($)
Financial risk management and financial instruments
Fair value of liabilities		R (1,473)
Cash flow hedge
Financial risk management and financial instruments
Contract/Notional amount | $	$ 1,950		$ 2,000		$ 1,950
Fair value of assets				R 246

X

- Definition

The amount of derivative financial assets held for hedging. [Refer: Derivative financial assets]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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X

- 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
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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.

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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
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-IssueDate 2018-01-01
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