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Financial instruments (Details) - ZAR (R)
R in Millions
Dec. 31, 2020
Jun. 30, 2020
Derivatives | Level 2    
Financial instruments    
Derivative financial assets (liabilities) - carrying value R (2,237) R (7,078)
Derivative financial assets (liabilities) - fair value (2,237) (7,078)
Derivative financial assets 1,200 600
Derivative financial liabilities (3,400) (7,700)
Derivatives | Level 3    
Financial instruments    
Derivative financial assets (liabilities) - carrying value (668) (2,168)
Derivative financial assets (liabilities) - fair value (668) (2,168)
Listed long-term debt | Level 1    
Financial instruments    
Financial liabilities - carrying value 50,373 56,760
Financial liabilities - fair value R 52,710 R 50,701