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Accounting Policies - Impact of adoption of IFRS 9 (Details) - ZAR (R) | Jul. 01, 2018 | Jun. 30, 2018
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Restricted cash | Loans and receivables |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |
Carrying amount before adoption of IFRS 9 |  | R 115,000,000
Restricted cash | Debt instruments at amortised cost |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |
Carrying amount after adoption of IFRS 9 | R 115,000,000 |
Cash and cash equivalents | Loans and receivables |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |
Carrying amount before adoption of IFRS 9 |  | 706,000,000
Cash and cash equivalents | Debt instruments at amortised cost |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |
Carrying amount after adoption of IFRS 9 | 706,000,000 |
Trade and other receivables | Loans and receivables |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |
Carrying amount before adoption of IFRS 9 |  | 626,000,000
Trade and other receivables | Debt instruments at amortised cost |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |
Carrying amount after adoption of IFRS 9 | 626,000,000 |
Restricted investments (cash and cash equivalents) | Loans and receivables |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |
Carrying amount before adoption of IFRS 9 |  | 23,000,000
Restricted investments (cash and cash equivalents) | Debt instruments at amortised cost |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |
Carrying amount after adoption of IFRS 9 | 23,000,000 |
Restricted investments (fixed deposits) | Held-to-maturity investments |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |
Carrying amount before adoption of IFRS 9 |  | 2,335,000,000
Restricted investments (fixed deposits) | Debt instruments at amortised cost |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |
Carrying amount after adoption of IFRS 9 | 2,335,000,000 |
Restricted investments (equity-linked deposits) | Financial assets at fair value through profit or loss |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |
Carrying amount before adoption of IFRS 9 |  | 913,000,000
Carrying amount after adoption of IFRS 9 | 913,000,000 |
Other non-current assets | Loans and receivables |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |
Carrying amount before adoption of IFRS 9 |  | 253,000,000
Other non-current assets | Financial assets at fair value through profit or loss |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |
Carrying amount after adoption of IFRS 9 | 253,000,000 |
Other non-current assets | Available-for-sale financial assets |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |
Carrying amount before adoption of IFRS 9 |  | 8,000,000
Other non-current assets | Equity instruments designated at fair value through OCI |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |
Carrying amount after adoption of IFRS 9 | 90,000,000 |
Other non-current assets, unquoted equity investments | Available-for-sale financial assets |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |
Carrying amount before adoption of IFRS 9 |  | 0
Other non-current assets, unquoted equity investments | Equity instruments designated at fair value through OCI |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |
Carrying amount after adoption of IFRS 9 | 82,000,000 |
Not designated as hedging instrument | Derivative financial instruments | Financial assets at fair value through profit or loss |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |
Carrying amount before adoption of IFRS 9 |  | (74,000,000)
Carrying amount after adoption of IFRS 9 | (74,000,000) |
Cash flow hedges | Designated as hedging instrument | Derivative financial instruments | Financial assets at fair value through profit or loss |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |
Carrying amount before adoption of IFRS 9 |  | R 482,000,000
Carrying amount after adoption of IFRS 9 | R 482,000,000 |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The carrying amount of financial assets immediately after the initial application of IFRS 9. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 42I -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_42I_b&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The carrying amount of financial assets at the date of initial application of IFRS 9, determined in accordance with IAS 39 or in accordance with a previous version of IFRS 9 (if the entity’s chosen approach to applying IFRS 9 involves more than one date of initial application for different requirements). [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 42I -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_42I_a&doctype=Standard -URIDate 2018-03-16 + Details
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