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 Millions, $ in Billions	12 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 ZAR (R)	Jun. 30, 2023 ZAR (R)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Net adjusted external debt	$ 0.4	$ 0.4	R 8	R 8,100
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		26.00%
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	21.00%	20.00%
Minority Discount [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment fair value measurement inputs	24.00%	24.00%