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Financial risk management and financial instruments - Summary of Financial Instruments (Details) - ZAR (R) R in Millions	Jun. 30, 2019	Jun. 30, 2018
Listed long-term debt
Financial risk management and financial instruments
Financial liabilities - fair value	R 49,421	R 13,345
Listed long-term debt | Liabilities, Amortised cost
Financial risk management and financial instruments
Financial liabilities - carrying value	46,060	13,704
Unlisted long-term debt
Financial risk management and financial instruments
Financial liabilities - fair value	91,777	95,984
Unlisted long-term debt | Liabilities, Amortised cost
Financial risk management and financial instruments
Financial liabilities - carrying value	91,279	95,750
Short-term debt and bank overdraft
Financial risk management and financial instruments
Financial liabilities - fair value	1,297	2,035
Short-term debt and bank overdraft | Liabilities, Amortised cost
Financial risk management and financial instruments
Financial liabilities - carrying value	1,297	2,035
Derivative liabilities and guarantees (Long- and short-term financial liabilities)
Financial risk management and financial instruments
Financial liabilities - fair value	2,205	2,059
Derivative liabilities and guarantees (Long- and short-term financial liabilities) | Liabilities, At fair value through profit and loss
Financial risk management and financial instruments
Financial liabilities - carrying value	2,205	2,059
Trade and other payables
Financial risk management and financial instruments
Financial liabilities - fair value	28,501	26,518
Trade and other payables | Liabilities, Amortised cost
Financial risk management and financial instruments
Financial liabilities - carrying value	28,501	26,518
Investments in listed securities
Financial risk management and financial instruments
Financial assets - fair value	830	682
Investments in listed securities | Assets, Designated at fair value through other comprehensive income
Financial risk management and financial instruments
Financial assets - carrying value	830
Investments in listed securities | Assets, Available-for-sale
Financial risk management and financial instruments
Financial assets - carrying value		682
Investments in unlisted securities
Financial risk management and financial instruments
Financial assets - fair value	393	244
Investments in unlisted securities | Assets, Designated at fair value through other comprehensive income
Financial risk management and financial instruments
Financial assets - carrying value	393
Investments in unlisted securities | Assets, Available-for-sale
Financial risk management and financial instruments
Financial assets - carrying value		244
Other long-term investments
Financial risk management and financial instruments
Financial assets - fair value	25	25
Other long-term investments | Assets, Amortised cost
Financial risk management and financial instruments
Financial assets - carrying value	25
Other long-term investments | Assets, Held-to-maturity
Financial risk management and financial instruments
Financial assets - carrying value		25
Long-term receivables
Financial risk management and financial instruments
Financial assets - fair value	5,582	3,824
Long-term receivables | Assets, Amortised cost
Financial risk management and financial instruments
Financial assets - carrying value	5,582	3,824
Derivative assets (Long and short-term financial assets)
Financial risk management and financial instruments
Financial assets - fair value	645	1,827
Derivative assets (Long and short-term financial assets) | Assets, At fair value through profit and loss
Financial risk management and financial instruments
Financial assets - carrying value	645	1,827
Trade and other receivables
Financial risk management and financial instruments
Financial assets - fair value	25,611	26,648
Trade and other receivables | Assets, Amortised cost
Financial risk management and financial instruments
Financial assets - carrying value	25,611	26,648
Cash and cash equivalents
Financial risk management and financial instruments
Financial assets - fair value	15,877	17,128
Cash and cash equivalents | Assets, Amortised cost
Financial risk management and financial instruments
Financial assets - carrying value	R 15,877	R 17,128

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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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