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Financial risk management and financial instruments - Statement of Financial Position and Income Statement Impact (Details) - ZAR (R) R in Millions | 12 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2021
Financial risk management and financial instruments |  |  |
Financial assets | R 92,029 | R 87,991 |
Financial liabilities | (177,816) | (168,123) |
Net gain/(loss) on derivative instruments | 3,287 | (18,325) | R 2,282
Commodity and currency derivatives, Embedded derivatives and Non-derivative financial instruments |  |  |
Financial risk management and financial instruments |  |  |
Financial assets | 2,225 | 868 |
Financial liabilities | (3,397) | (7,127) |
Net gain/(loss) on derivative instruments | 3,287 | (18,325) | 2,282
Interest rate swap |  |  |
Financial risk management and financial instruments |  |  |
Net gain/(loss) on derivative instruments |  | 1,029 | (37)
Crude oil put options |  |  |
Financial risk management and financial instruments |  |  |
Financial assets | 253 |  |
Net gain/(loss) on derivative instruments | (507) |  | (1,545)
Crude oil zero cost collar |  |  |
Financial risk management and financial instruments |  |  |
Financial assets |  | 17 |
Financial liabilities |  | (6,176) |
Net gain/(loss) on derivative instruments | 3,953 | (11,349) | (1,871)
Crude oil swap options |  |  |
Financial risk management and financial instruments |  |  |
Net gain/(loss) on derivative instruments |  | (5,140) | (1,267)
Crude oil futures |  |  |
Financial risk management and financial instruments |  |  |
Financial assets |  | 25 |
Financial liabilities | (12) |  |
Net gain/(loss) on derivative instruments | 401 | (1,049) | (774)
Ethane swap options |  |  |
Financial risk management and financial instruments |  |  |
Financial liabilities | (158) |  |
Net gain/(loss) on derivative instruments | (272) | 279 | 680
Coal swap options |  |  |
Financial risk management and financial instruments |  |  |
Financial liabilities |  | (112) |
Net gain/(loss) on derivative instruments | 1,099 | 691 |
Other commodity derivatives |  |  |
Financial risk management and financial instruments |  |  |
Financial assets | 10 | 61 |
Financial liabilities |  | (53) |
Net gain/(loss) on derivative instruments | 180 | (593) |
Forward exchange contracts |  |  |
Financial risk management and financial instruments |  |  |
Financial assets | 133 | 68 |
Financial liabilities | (353) | (50) |
Net gain/(loss) on derivative instruments | (1,339) | (677) | 1,011
Foreign exchange zero cost collars |  |  |
Financial risk management and financial instruments |  |  |
Financial assets | 76 | 76 |
Financial liabilities | (579) | (454) |
Net gain/(loss) on derivative instruments | (301) | (1,580) | 4,027
Convertible bond embedded derivative |  |  |
Financial risk management and financial instruments |  |  |
Financial liabilities | (1,302) |  |
Net gain/(loss) on derivative instruments | 867 |  |
Oxygen supply contract embedded derivative assets and liabilities |  |  |
Financial risk management and financial instruments |  |  |
Financial assets | 516 | 621 |
Financial liabilities | (993) | (282) |
Net gain/(loss) on derivative instruments | (794) | R 64 | R 2,058
Investments at fair value through profit or loss |  |  |
Financial risk management and financial instruments |  |  |
Financial assets | R 1,237 |  |

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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 2022-03-24 -Paragraph 35H -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_35H&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 35M -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_35M&doctype=Standard -URIDate 2022-03-24 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 35N -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_35N&doctype=Standard -URIDate 2022-03-24 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 35I -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_35I&doctype=Standard -URIDate 2022-03-24 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_25&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_25&doctype=Standard -URIDate 2022-03-24 + Details
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