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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, 2021
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2021
ZAR (R)
Jun. 30, 2021
ZAR (R)
Net adjusted external debt $ 0.7 $ 0.8 R 11.5 R 11.2
Lease liabilities included in net adjusted external debt     R 0.0 R 0.0
Weighted Average Cost of Capital (WACC) Rate [Member] | Minimum [Member]        
Investment fair value measurement inputs 18.00% 18.00%    
Weighted Average Cost of Capital (WACC) Rate [Member] | Maximum [Member]        
Investment fair value measurement inputs 24.00% 24.00%    
Long Term Growth Rate [Member]        
Investment fair value measurement inputs 3.00% 3.00%    
Marketability Discount [Member]        
Investment fair value measurement inputs 10.00%      
Minority Discount [Member]        
Investment fair value measurement inputs 15.00%