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Financial Risk Management - Schedule of Financial Assets and Liabilities (Details) - ZAR (R) R in Millions | Jun. 30, 2019 | Jun. 30, 2018
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Borrowings | Financial liabilities at amortised cost |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial liabilities | R 5,915 | R 5,614
Other non-current liabilities | Financial liabilities at amortised cost |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial liabilities | 2 | 1
Trade and other payables | Financial liabilities at amortised cost |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial liabilities | 930 | 769
Restricted cash | Debt instruments at amortised cost |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial assets | 136 |
Restricted cash | Loans and receivables |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial assets |  | 115
Restricted investments | Debt instruments at amortised cost |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial assets | 2,045 |
Restricted investments | Loans and receivables |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial assets |  | 23
Restricted investments | Financial assets at fair value through profit or loss |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial assets | 1,256 | 913
Restricted investments | Held-to-maturity investments |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial assets |  | 2,335
Other non-current assets | Debt instruments at amortised cost |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial assets | 3 |
Other non-current assets | Loans and receivables |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial assets |  | 253
Other non-current assets | Equity instruments designated at fair value through OCI |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial assets | 59 |
Other non-current assets | Available-for-sale financial assets |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial assets |  | 8
Other non-current assets | Financial assets at fair value through profit or loss |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial assets | 271 |
Trade and other receivables | Debt instruments at amortised cost |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial assets | 627 |
Trade and other receivables | Loans and receivables |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial assets |  | 626
Cash and cash equivalents | Debt instruments at amortised cost |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial assets | 993 |
Cash and cash equivalents | Loans and receivables |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial assets |  | 706
Not designated as hedging instrument | Non-current derivative financial instruments | Financial liabilities at fair value through profit or loss |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial liabilities |  | 10
Not designated as hedging instrument | Current derivative financial instruments | Financial liabilities at fair value through profit or loss |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial liabilities | 65 | 205
Not designated as hedging instrument | Non-current derivative financial instruments | Financial assets at fair value through profit or loss |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial assets | 173 | 14
Not designated as hedging instrument | Current derivative financial instruments | Financial assets at fair value through profit or loss |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial assets | 283 | 127
Not designated as hedging instrument | Rand gold hedging contracts | Current derivative financial instruments | Financial liabilities at fair value through profit or loss |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial liabilities | 61 |
Not designated as hedging instrument | US$ commodity contracts | Current derivative financial instruments | Financial liabilities at fair value through profit or loss |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial liabilities | 2 |
Not designated as hedging instrument | Foreign exchange hedging contracts | Current derivative financial instruments | Financial liabilities at fair value through profit or loss |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial liabilities | 2 |
Not designated as hedging instrument | Foreign exchange hedging contracts | Non-current derivative financial instruments | Financial assets at fair value through profit or loss |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial assets | 173 |
Not designated as hedging instrument | Foreign exchange hedging contracts | Current derivative financial instruments | Financial assets at fair value through profit or loss |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial assets | 283 |
Cash flow hedges | Designated as hedging instrument | Non-current derivative financial instruments | Financial liabilities at fair value through profit or loss |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial liabilities | 172 |
Cash flow hedges | Designated as hedging instrument | Current derivative financial instruments | Financial liabilities at fair value through profit or loss |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial liabilities | 205 |
Cash flow hedges | Designated as hedging instrument | Non-current derivative financial instruments | Financial assets at fair value through profit or loss |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial assets | 24 | 70
Cash flow hedges | Designated as hedging instrument | Current derivative financial instruments | Financial assets at fair value through profit or loss |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial assets | 26 | R 412
Cash flow hedges | Rand gold hedging contracts | Designated as hedging instrument | Non-current derivative financial instruments | Financial liabilities at fair value through profit or loss |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial liabilities | 158 |
Cash flow hedges | Rand gold hedging contracts | Designated as hedging instrument | Current derivative financial instruments | Financial liabilities at fair value through profit or loss |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial liabilities | 164 |
Cash flow hedges | Rand gold hedging contracts | Designated as hedging instrument | Non-current derivative financial instruments | Financial assets at fair value through profit or loss |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial assets | 23 |
Cash flow hedges | Rand gold hedging contracts | Designated as hedging instrument | Current derivative financial instruments | Financial assets at fair value through profit or loss |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial assets | 22 |
Cash flow hedges | US$ commodity contracts | Designated as hedging instrument | Non-current derivative financial instruments | Financial liabilities at fair value through profit or loss |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial liabilities | 14 |
Cash flow hedges | US$ commodity contracts | Designated as hedging instrument | Current derivative financial instruments | Financial liabilities at fair value through profit or loss |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial liabilities | 41 |
Cash flow hedges | US$ commodity contracts | Designated as hedging instrument | Non-current derivative financial instruments | Financial assets at fair value through profit or loss |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial assets | 1 |
Cash flow hedges | US$ commodity contracts | Designated as hedging instrument | Current derivative financial instruments | Financial assets at fair value through profit or loss |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial assets | R 4 |

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- Definition 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] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_25&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35H&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35I&doctype=Standard -URIDate 2018-03-16 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35M&doctype=Standard -URIDate 2018-03-16 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35N&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) 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 deliver 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, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are 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. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_25&doctype=Standard -URIDate 2018-03-16 + Details
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