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Financial risk management and financial instruments - Commodity Price Risk (Details) R in Millions, $ in Millions	12 Months Ended
	Jun. 30, 2019 USD ($) $ / bbl	Jun. 30, 2018 USD ($) $ / bbl	Jun. 30, 2019 ZAR (R)	Jun. 30, 2018 ZAR (R)
Crude oil futures
Financial risk management and financial instruments
Contract/Notional amount	$ 92	$ 194	R 1,521	R 2,792
Fair value			(27)	(91)
Other commodity derivatives
Financial risk management and financial instruments
Contract/Notional amount			254
Fair value			21
Maximum
Financial risk management and financial instruments
Dated Brent Crude price | $ / bbl	86.16	80.29
Average
Financial risk management and financial instruments
Dated Brent Crude price | $ / bbl	68.63	63.62
Minimum
Financial risk management and financial instruments
Dated Brent Crude price | $ / bbl	50.21	46.53
Within one year | Crude oil futures
Financial risk management and financial instruments
Fair value			(27)	R (91)
Within one year | Other commodity derivatives
Financial risk management and financial instruments
Fair value			R 21

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The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Dated Brent Crude price

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The amount of financial assets classified as derivative instruments less the amount of financial liabilities classified as derivative instruments.

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