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Financial risk management and financial instruments - Summary of Financial Instruments (Details) - ZAR (R) R in Millions	Jun. 30, 2018	Jun. 30, 2017
Listed long-term debt
Financial risk management and financial instruments
Financial liabilities - fair value	R 13,345	R 13,365
Unlisted long-term debt
Financial risk management and financial instruments
Financial liabilities - fair value	95,984	68,896
Short-term debt and bank overdraft
Financial risk management and financial instruments
Financial liabilities - fair value	2,035	2,986
Derivative liabilities and guarantees (Long- and short-term financial liabilities)
Financial risk management and financial instruments
Financial liabilities - fair value	2,059	1,473
Trade and other payables
Financial risk management and financial instruments
Financial liabilities - fair value	26,518	26,131
Investments in listed securities
Financial risk management and financial instruments
Financial assets - fair value	682	681
Investments in listed securities | Assets, Available-for-sale
Financial risk management and financial instruments
Financial assets - carrying value	682	681
Investments in unlisted securities
Financial risk management and financial instruments
Financial assets - fair value	244	225
Investments in unlisted securities | Assets, Available-for-sale
Financial risk management and financial instruments
Financial assets - carrying value	244	225
Other long-term investments
Financial risk management and financial instruments
Financial assets - fair value	25	81
Other long-term investments | Assets, Held-to-maturity
Financial risk management and financial instruments
Financial assets - carrying value	25	81
Long-term receivables
Financial risk management and financial instruments
Financial assets - fair value	3,786	3,737
Long-term receivables | Assets, Amortised cost
Financial risk management and financial instruments
Financial assets - carrying value	3,786	3,737
Derivative assets (Long and short-term financial assets)
Financial risk management and financial instruments
Financial assets - fair value	1,827	2,739
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	1,827	2,739
Trade and other receivables
Financial risk management and financial instruments
Financial assets - fair value	26,648	24,675
Trade and other receivables | Assets, Amortised cost
Financial risk management and financial instruments
Financial assets - carrying value	26,648	24,675
Cash and cash equivalents
Financial risk management and financial instruments
Financial assets - fair value	17,128	29,446
Cash and cash equivalents | Assets, Amortised cost
Financial risk management and financial instruments
Financial assets - carrying value	17,128	29,446
Liabilities, At fair value through profit and loss | Derivative liabilities and guarantees (Long- and short-term financial liabilities)
Financial risk management and financial instruments
Financial liabilities - carrying value	2,059	1,473
Liabilities, Amortised cost | Listed long-term debt
Financial risk management and financial instruments
Financial liabilities - carrying value	13,704	13,014
Liabilities, Amortised cost | Unlisted long-term debt
Financial risk management and financial instruments
Financial liabilities - carrying value	95,750	68,153
Liabilities, Amortised cost | Short-term debt and bank overdraft
Financial risk management and financial instruments
Financial liabilities - carrying value	2,035	2,986
Liabilities, Amortised cost | Trade and other payables
Financial risk management and financial instruments
Financial liabilities - carrying value	R 26,518	R 26,131

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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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