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Financial risk management and financial instruments - Derivatives Designated in Hedge Relationships (Details) - Interest rate swap - Cash flow hedge R in Millions, $ in Millions	1 Months Ended
	Jul. 31, 2015 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2018 ZAR (R)	Jun. 30, 2017 USD ($)	Jun. 30, 2017 ZAR (R)
Financial risk management and financial instruments
Percentage of LIBOR exposure hedged	50.00%
Contract/Notional amount | $	$ 3,995	$ 2,000		$ 1,980
Fair value of assets			R 246
Fair value of liabilities					R (1,070)

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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- Definition

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

+ 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

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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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- Definition

The percentage of the underlying liability's variable interest rate exposure that is hedged.

+ References

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