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Financial risk management and financial instruments - Expected credit losses (Details) - ZAR (R) R in Millions	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
AAA to A-
Detail on expected credit losses recognised
Percentage of financial assets at amortised cost	85.00%
BBB to B-
Detail on expected credit losses recognised
Percentage of financial assets at amortised cost	8.00%
CCC+ and below
Detail on expected credit losses recognised
Percentage of financial assets at amortised cost	7.00%
Impairment
Detail on expected credit losses recognised
Additional impairments	R 199
Receivables | Impairment
Detail on expected credit losses recognised
Financial assets	664	R 465
Receivables | Lifetime | Impairment
Detail on expected credit losses recognised
Financial assets	640
Receivables | 12-months | Impairment
Detail on expected credit losses recognised
Financial assets	24
Long-term receivables | Impairment
Detail on expected credit losses recognised
Financial assets	211	38
Long-term receivables | Lifetime | Impairment
Detail on expected credit losses recognised
Financial assets	211
Trade receivable | Impairment
Detail on expected credit losses recognised
Financial assets	225	199
Trade receivable | Lifetime | Impairment
Detail on expected credit losses recognised
Financial assets	225
Other receivables | Impairment
Detail on expected credit losses recognised
Financial assets	228	R 228
Other receivables | Lifetime | Impairment
Detail on expected credit losses recognised
Financial assets	204
Other receivables | 12-months | Impairment
Detail on expected credit losses recognised
Financial assets	R 24

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The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

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