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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]
$ in Millions, R in Billions
 3 Months Ended 12 Months Ended
Sep. 30, 2019
ZAR (R)
Jun. 30, 2019
ZAR (R)
Sep. 30, 2019
USD ($)
 [1]
Jun. 30, 2019
USD ($)
 [2]
Net adjusted external debt R 14.8 [1] R 13.9 [2] $ 982.7 $ 987.2
Lease liabilities included in net adjusted external debt 6.0 [1] 6.4 [2]    
Deferred tax including assessed tax losses R 2.9 [1] R 2.9 [2] $ 19.1 $ 20.6
Weighted Average Cost of Capital (WACC) Rate [Member] | Minimum [Member]        
Investment fair value measurement inputs 15.00% 15.00%    
Weighted Average Cost of Capital (WACC) Rate [Member] | Maximum [Member]        
Investment fair value measurement inputs 20.00% 20.00%    
Long Term Growth Rate [Member]        
Investment fair value measurement inputs 4.00% 4.50%    
Marketability Discount [Member]        
Investment fair value measurement inputs 10.00% 10.00%    
Minority Discount [Member]        
Investment fair value measurement inputs 15.00% 15.00%    
[1] translated from ZAR to U.S. dollars at exchange rates applicable as of September 30, 2019.
[2] translated from ZAR to U.S. dollars at exchange rates applicable as of June 30, 2019.