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Fair Value Of Financial Instruments (Schedule Of Key Valuation Inputs Used To Measure Fair Value Of Investment In Cell C) (Details) - Cell C [Member] R in Billions, $ in Billions | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2023 ZAR (R) | Jun. 30, 2023 ZAR (R)
Net adjusted external debt | $ 0.4 | $ 0.4 | R 8.0 | R 8.1
Weighted Average Cost of Capital (WACC) Rate [Member] | Minimum [Member] |  |  |  |
Investment fair value measurement inputs | 20.00% |  |  |
Weighted Average Cost of Capital (WACC) Rate [Member] | Maximum [Member] |  |  |  |
Investment fair value measurement inputs | 31.00% |  |  |
Long Term Growth Rate [Member] |  |  |  |
Investment fair value measurement inputs | 4.50% | 4.50% |  |
Marketability Discount [Member] |  |  |  |
Investment fair value measurement inputs | 20.00% | 20.00% |  |
Minority Discount [Member] |  |  |  |
Investment fair value measurement inputs | 24.00% | 24.00% |  |

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- Definition Net Adjusted External Debt + References No definition available. + Details
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