Group    
   (R’million) 2018     2017    
28  Pension obligations         
   Movement in the net asset/(liability) recognised in the statement of financial position         
   Balance at beginning of the year   121,5     105,1   
   Contributions paid  268,5     239,4   
   Other movements (net expense in the income statement) (261,3)    (235,2)   
   Interest cost  (25,0)    (27,2)   
   Current service cost  (270,4)    (243,6)   
   Interest on plan assets  35,7     38,5    
   Interest on limit  (1,6)    (2,9)   
   Remeasurements recognised in other comprehensive income  4,4     12,2   
   Net actuarial gains/(losses) raised in terms of IAS 19R  8,0     (4,2)   
   Unrecognised due to paragraph 65 limit in terms of IAS 19R  (3,6)    16,4    
   Balance at end of the year  133,1     121,5    
   The net asset is included in the statement of financial position as follows:            
   Investments – refer to note 15  70,5     53,8   
   Other receivables – refer to note 19  64,5     70,3   
   Other payables – refer to note 23  (1,9)    (2,6)   
      133,1     121,5    
   Detailed disclosure and the respective assumptions and valuation inputs have been included in Annexure E.