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Financial risk management and financial instruments - Summary of Financial Instruments (Details) - ZAR (R)
R in Millions
Jun. 30, 2022
Jun. 30, 2021
Listed long-term debt    
Financial risk management and financial instruments    
Financial liabilities - fair value R 71,667 R 72,226
Listed long-term debt | Liabilities, Amortised cost    
Financial risk management and financial instruments    
Financial liabilities - carrying value 78,076 68,405
Unlisted long-term debt    
Financial risk management and financial instruments    
Financial liabilities - fair value 26,824 34,274
Unlisted long-term debt | Liabilities, Amortised cost    
Financial risk management and financial instruments    
Financial liabilities - carrying value 26,758 34,238
Lease liabilities | Liabilities, Amortised cost    
Financial risk management and financial instruments    
Financial liabilities - carrying value 16,034 15,677
Short-term debt and bank overdraft    
Financial risk management and financial instruments    
Financial liabilities - fair value 255 303
Short-term debt and bank overdraft | Liabilities, Amortised cost    
Financial risk management and financial instruments    
Financial liabilities - carrying value 255 303
Long- and short-term financial liabilities    
Financial risk management and financial instruments    
Financial liabilities - fair value 7,127 5,173
Long- and short-term financial liabilities | Liabilities, At fair value through profit and loss    
Financial risk management and financial instruments    
Financial liabilities - carrying value 7,127 3,070
Long- and short-term financial liabilities | Liabilities, Designated hedging instrument at fair value    
Financial risk management and financial instruments    
Financial liabilities - carrying value   2,103
Trade and other payables    
Financial risk management and financial instruments    
Financial liabilities - fair value 39,873 23,289
Trade and other payables | Liabilities, Amortised cost    
Financial risk management and financial instruments    
Financial liabilities - carrying value 39,873 23,289
Investments in listed securities    
Financial risk management and financial instruments    
Financial assets - fair value 480 466
Investments in listed securities | Assets, Designated at fair value through other comprehensive income    
Financial risk management and financial instruments    
Financial assets - carrying value 480 466
Investments in unlisted securities    
Financial risk management and financial instruments    
Financial assets - fair value 13 8
Investments in unlisted securities | Assets, Designated at fair value through other comprehensive income    
Financial risk management and financial instruments    
Financial assets - carrying value 13 8
Long-term restricted cash    
Financial risk management and financial instruments    
Financial assets - fair value 1,531 1,422
Long-term restricted cash | Assets, Amortised cost    
Financial risk management and financial instruments    
Financial assets - carrying value 1,531 1,422
Long-term receivables    
Financial risk management and financial instruments    
Financial assets - fair value 3,023 3,879
Long-term receivables | Assets, Amortised cost    
Financial risk management and financial instruments    
Financial assets - carrying value 3,023 3,879
Long and short-term financial assets    
Financial risk management and financial instruments    
Financial assets - fair value 868 2,323
Long and short-term financial assets | Assets, At fair value through profit and loss    
Financial risk management and financial instruments    
Financial assets - carrying value 868 2,323
Trade and other receivables    
Financial risk management and financial instruments    
Financial assets - fair value 38,936 27,140
Trade and other receivables | Assets, Amortised cost    
Financial risk management and financial instruments    
Financial assets - carrying value 38,936 27,140
Cash and cash equivalents    
Financial risk management and financial instruments    
Financial assets - fair value 43,140 31,231
Cash and cash equivalents | Assets, Amortised cost    
Financial risk management and financial instruments    
Financial assets - carrying value R 43,140 R 31,231