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Salient features - Other financial information (Details)
R in Millions, $ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2019
ZAR (R)
employee
Dec. 31, 2018
ZAR (R)
Jun. 30, 2019
ZAR (R)
employee
Dec. 31, 2018
USD ($)
employee
Dec. 31, 2018
ZAR (R)
employee
Other financial information          
Total debt (including bank overdraft) R 155,610   R 138,636   R 131,578
interest-bearing debt 155,546   137,691   130,800
non-interest-bearing debt 64   945   R 778
Finance expense capitalised R 1,974 R 3,440 R 6,942    
Effective tax rate 40.70% 24.10% 34.20%    
Number of employees | employee 31,363   31,429 31,430 31,430
Difference between effective corporate tax rate and South African corporate income tax rate 12.70%        
South Africa          
Other financial information          
Applicable tax rate 28.00%        
Subsidiaries and joint operations          
Other financial information          
Total capital commitments R 49,394   R 60,095   R 71,248
authorised and contracted 217,047   212,848   187,515
authorised, not yet contracted 37,827   43,097   53,163
less expenditure to date (205,480)   (195,850)   (169,430)
Subsidiaries and joint operations | Originally presented          
Other financial information          
Total capital commitments         58,640
Subsidiaries and joint operations | Increase due to review of forecast          
Other financial information          
Total capital commitments       $ 878 12,608
Equity accounted investments          
Other financial information          
Total capital commitments 1,957   1,283   1,018
authorised and contracted 641   715   618
authorised, not yet contracted 1,912   1,100   620
less expenditure to date R (596)   R (532)   R (220)