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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	12 Months Ended
	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 ZAR (R)	Jun. 30, 2024 ZAR (R)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Net adjusted external debt	$ 0.5	$ 0.4	R 8.3	R 8.0
Weighted Average Cost of Capital (WACC) Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment fair value measurement inputs	24.00%
Weighted Average Cost of Capital (WACC) Rate [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment fair value measurement inputs	21.00%
Weighted Average Cost of Capital (WACC) Rate [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment fair value measurement inputs		23.00%
Long Term Growth Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment fair value measurement inputs	4.50%	4.50%
Marketability Discount [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment fair value measurement inputs	15.00%	20.00%
Minority Discount [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment fair value measurement inputs	17.00%	24.00%

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
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-Name Accounting Standards Codification
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-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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