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Commitments And Contingencies (Narrative) (Details)
R in Millions, $ in Millions
Mar. 23, 2018
ZAR (R)
Dec. 31, 2018
ZAR (R)
Dec. 31, 2018
USD ($)
Guarantor Obligations [Line Items]      
Maximum payment amount under guarantee   R 96.0 $ 6.7
Counter Guarantee [Member]      
Guarantor Obligations [Line Items]      
Guarantee amount   R 96.0 $ 6.7
Payment Guarantee [Member] | Minimum [Member]      
Guarantor Obligations [Line Items]      
Charge rate   0.40% 0.40%
Payment Guarantee [Member] | Maximum [Member]      
Guarantor Obligations [Line Items]      
Charge rate   1.94% 1.94%
Nedbank [Member] | Guarantee [Member]      
Guarantor Obligations [Line Items]      
Guarantee amount   R 96.0 $ 6.7
CPS [Member] | Additional Implementation Costs [Member]      
Guarantor Obligations [Line Items]      
Amount ordered to refund to SASSA R 317.0