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Derivative Financial Instruments - Disclosure of Derivative Financial Assets and Liabilities (Details) R in Millions | 12 Months Ended
--- | ---
Jun. 30, 2019 ZAR (R) | Jun. 30, 2018 ZAR (R) | Jun. 30, 2017 ZAR (R)
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative financial assets | R 506 | R 623 |
Non-current | 197 | 84 |
Current | 309 | 539 |
Derivative financial liabilities | (442) | (215) |
Non-current | (172) | (10) |
Current | (270) | (205) |
Net derivative financial instruments | 64 | 408 |
Unamortised day one net loss included above | 41 | 11 |
Realised gains included in revenue | 453 | 1,197 | R 728
Unrealised gains/(losses) included in other reserves | (214) | 413 | 1,143
Gains/(losses) included in gains on derivatives | 516 | 136 | 1,103
Hedge ineffectiveness |  |  | 16
Day one loss amortisation | (32) | (37) | (94)
Total gains on derivatives | 484 | 99 | 1,025
Hedge effectiveness |  |  |
Cumulative changes in the fair value of the hedging instrument used as the basis for recognising hedge ineffectiveness | 239 |  |
Cumulative changes in the fair value of the hedged item used as the basis for recognising hedge ineffectiveness. | (239) |  |
Rand gold hedging contracts |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative financial assets | 45 | 482 |
Non-current | 23 | 70 |
Current | 22 | 412 |
Derivative financial liabilities | (383) | (12) |
Non-current | (158) | (10) |
Current | (225) | (2) |
Net derivative financial instruments | (338) | 470 |
Unamortised day one net loss included above | 36 | 11 |
Realised gains included in revenue | 453 | 1,197 | 728
Unrealised gains/(losses) included in other reserves | (165) | 413 |
Gains/(losses) included in gains on derivatives | (51) | (12) | 0
Hedge ineffectiveness |  |  | 16
Day one loss amortisation | (31) | (37) | (94)
Total gains on derivatives | (82) | (49) | (78)
Hedge effectiveness |  |  |
Cumulative changes in the fair value of the hedging instrument used as the basis for recognising hedge ineffectiveness | 288 |  |
Cumulative changes in the fair value of the hedged item used as the basis for recognising hedge ineffectiveness. | (288) |  |
US$ commodity contracts |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative financial assets | 5 | 74 |
Non-current | 1 | 11 |
Current | 4 | 63 |
Derivative financial liabilities | (57) | 0 |
Non-current | (14) | 0 |
Current | (43) | 0 |
Net derivative financial instruments | (52) | 74 |
Unamortised day one net loss included above | 5 | 0 |
Realised gains included in revenue | 0 | 0 | 0
Unrealised gains/(losses) included in other reserves | (49) | 0 |
Gains/(losses) included in gains on derivatives | 13 | 35 | 20
Hedge ineffectiveness |  |  | 0
Day one loss amortisation | (1) | 0 | 0
Total gains on derivatives | 12 | 35 | 20
Hedge effectiveness |  |  |
Cumulative changes in the fair value of the hedging instrument used as the basis for recognising hedge ineffectiveness | (49) |  |
Cumulative changes in the fair value of the hedged item used as the basis for recognising hedge ineffectiveness. | 49 |  |
Foreign exchange hedging contracts |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative financial assets | 456 | 67 |
Non-current | 173 | 3 |
Current | 283 | 64 |
Derivative financial liabilities | (2) | (203) |
Non-current | 0 | 0 |
Current | (2) | (203) |
Net derivative financial instruments | 454 | (136) |
Unamortised day one net loss included above | 0 | 0 |
Realised gains included in revenue | 0 | 0 | 0
Unrealised gains/(losses) included in other reserves | 0 | 0 |
Gains/(losses) included in gains on derivatives | 554 | 113 | 1,083
Hedge ineffectiveness |  |  | 0
Day one loss amortisation | 0 | 0 | 0
Total gains on derivatives | 554 | R 113 | R 1,083
Hedge effectiveness |  |  |
Cumulative changes in the fair value of the hedging instrument used as the basis for recognising hedge ineffectiveness | 0 |  |
Cumulative changes in the fair value of the hedged item used as the basis for recognising hedge ineffectiveness. | R 0 |  |
Designated as hedging instrument | Gold derivative contracts |  |  |
Hedge effectiveness |  |  |
Hedge ratio | 1 |  |

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- Definition The amount of current derivative financial assets. [Refer: Derivative financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The gain (loss) on the change in fair value of the hedged item used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 24B -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_24B_a_iv&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 24B -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_24B_b_i&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The gain (loss) on the change in fair value of the hedging instrument used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 24A -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_24A_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The gain (loss) recognised in profit or loss on hedge ineffectiveness. [Refer: Gain (loss) on hedge ineffectiveness] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 24C -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_24C_a_i&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 24C -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_24C_b_ii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of non-current derivative financial assets. [Refer: Derivative financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
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