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Basis of preparation - Standards not yet applied (Details) - ZAR (R) R in Billions | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Disclosure of expected impact of initial application of new standards or interpretations |  |  |  |
Gearing ratio |  | 48.90% | 42.40% | 38.00%
Minimum | Increase (decrease) due to application of IFRS 16 | Forecast |  |  |  |
Disclosure of expected impact of initial application of new standards or interpretations |  |  |  |
Liabilities | R 9 |  |  |
Lease asset | R 9 |  |  |
Gearing ratio | 3.80% |  |  |
Maximum | Increase (decrease) due to application of IFRS 16 | Forecast |  |  |  |
Disclosure of expected impact of initial application of new standards or interpretations |  |  |  |
Liabilities | R 12 |  |  |
Lease asset | R 12 |  |  |
Gearing ratio | 5.10% |  |  |

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