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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)
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

X

- 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
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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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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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