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Commitments and Contingencies - Narrative (Details) R in Millions, $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 01, 2008 ZAR (R) shares | Jun. 30, 2019 ZAR (R) | Jun. 30, 2018 ZAR (R) | Dec. 01, 2008 USD ($)
Disclosure of contingent liabilities [line items] |  |  |  |
Contractual obligations in respect of mineral tenement leases |  | R 83 | R 59 |
Additional cash payable when decision to mine is made | $ |  |  |  | $ 6
Period of inactivity by the plaintiffs |  | 5 years |  |
Wafi-Golpu joint operation |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |
Contractual obligations in respect of mineral tenement leases |  | R 81 | R 58 |
Additional cash payable when decision to mine is made | $ |  |  |  | 4
Rio Tinto |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |
Shares issued for purchase of rights to the royalty agreement (in shares) | shares | 3,364,675 |  |  |
Value of shares on transaction date | R 242 |  |  |
Additional cash payable when decision to mine is made | $ |  |  |  | $ 10
Liability for environmental disturbances and degradation caused before the effective date (in excess of) |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |
Financial exposure |  | 75 |  |
Liability for environmental disturbances and degradation caused before the effective date (in excess of) | Rand Uranium |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |
Financial exposure |  | R 75 |  |

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