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Financial risk management and financial instruments - Summary of Financial Instruments (Details) - ZAR (R)
R in Millions
Jun. 30, 2024
Jun. 30, 2023
Financial risk management and financial instruments    
Financial assets - carrying value R 86,216 R 92,029
Financial liabilities - carrying value 168,266 177,816
Long-term debt    
Financial risk management and financial instruments    
Financial liabilities - carrying value 117,031 124,068
Long-term debt | At amortised cost    
Financial risk management and financial instruments    
Financial liabilities - carrying value 117,031 124,068
Financial liabilities - fair value 113,315 116,533
Listed long-term debt | At amortised cost | Level 1 | USD    
Financial risk management and financial instruments    
Financial liabilities - carrying value 59,687 90,248
Financial liabilities - fair value 55,778 82,768
Listed long-term debt | At amortised cost | Level 2 | ZAR    
Financial risk management and financial instruments    
Financial liabilities - carrying value 4,530 2,106
Financial liabilities - fair value 4,453 2,079
Listed convertible bonds | At amortised cost | Level 3    
Financial risk management and financial instruments    
Financial liabilities - carrying value 12,099 12,238
Financial liabilities - fair value 12,276 12,072
Unlisted long-term debt | At amortised cost | Level 3    
Financial risk management and financial instruments    
Financial liabilities - carrying value 40,715 19,476
Financial liabilities - fair value 40,808 19,614
Lease liabilities    
Financial risk management and financial instruments    
Financial liabilities - carrying value 17,437 16,297
Lease liabilities | At amortised cost    
Financial risk management and financial instruments    
Financial liabilities - carrying value 17,437 16,297
Short-term debt and bank overdraft | At amortised cost | Level 3    
Financial risk management and financial instruments    
Financial liabilities - carrying value 687 238
Financial liabilities - fair value 687 238
Trade and other payables    
Financial risk management and financial instruments    
Financial liabilities - carrying value 32,551 35,118
Trade and other payables | At amortised cost | Level 3    
Financial risk management and financial instruments    
Financial liabilities - carrying value 32,551 35,118
Financial liabilities - fair value 32,551 35,118
Long-term and short-term financial liabilities | At fair value through profit or loss    
Financial risk management and financial instruments    
Financial liabilities - carrying value 619 3,397
Financial liabilities - fair value 619 3,397
Commodity and currency derivative liabilities | At fair value through profit or loss | Level 2    
Financial risk management and financial instruments    
Financial liabilities - carrying value 18 1,102
Financial liabilities - fair value 18 1,102
Convertible bond embedded derivative liability | At fair value through profit or loss | Level 3    
Financial risk management and financial instruments    
Financial liabilities - carrying value 59 1,302
Financial liabilities - fair value 59 1,302
Oxygen supply contract embedded derivative liabilities | At fair value through profit or loss | Level 3    
Financial risk management and financial instruments    
Financial liabilities - carrying value 542 993
Financial liabilities - fair value 542 993
Long-term restricted cash    
Financial risk management and financial instruments    
Financial assets - carrying value 1,709 1,447
Long-term restricted cash | At amortised cost | Level 1    
Financial risk management and financial instruments    
Financial assets - carrying value 1,709 1,447
Financial assets - fair value 1,709 1,447
Long-term receivables    
Financial risk management and financial instruments    
Financial assets - carrying value 3,051 2,803
Long-term receivables | At amortised cost | Level 3    
Financial risk management and financial instruments    
Financial assets - carrying value 3,051 2,803
Financial assets - fair value 2,906 2,803
Trade and other receivables    
Financial risk management and financial instruments    
Financial assets - carrying value 31,272 30,915
Trade and other receivables | At amortised cost | Level 3    
Financial risk management and financial instruments    
Financial assets - carrying value 31,272 30,915
Financial assets - fair value 31,272 30,915
Cash and cash equivalents    
Financial risk management and financial instruments    
Financial assets - carrying value 45,383 53,926
Cash and cash equivalents | At amortised cost | Level 1    
Financial risk management and financial instruments    
Financial assets - carrying value 45,383 53,926
Financial assets - fair value 45,383 53,926
Long and short-term financial assets | At fair value through profit or loss    
Financial risk management and financial instruments    
Financial assets - carrying value 3,978 2,225
Financial assets - fair value 3,978 2,225
Commodity and currency derivative assets | At fair value through profit or loss | Level 2    
Financial risk management and financial instruments    
Financial assets - carrying value 1,297 472
Financial assets - fair value 1,297 472
Oxygen supply contract embedded derivative assets | At fair value through profit or loss | Level 3    
Financial risk management and financial instruments    
Financial assets - carrying value 508 516
Financial assets - fair value 508 516
Other short-term investments | At fair value through profit or loss | Level 1    
Financial risk management and financial instruments    
Financial assets - carrying value 2,173 1,237
Financial assets - fair value 2,173 1,237
Other long-term investments | At fair value through profit or loss | Level 1    
Financial risk management and financial instruments    
Financial assets - carrying value 814  
Financial assets - fair value 814  
Investments in listed securities | Designated at fair value through other comprehensive income | Level 1    
Financial risk management and financial instruments    
Financial assets - carrying value   701
Financial assets - fair value   701
Investments in unlisted securities | Designated at fair value through other comprehensive income | Level 3    
Financial risk management and financial instruments    
Financial assets - carrying value 9 12
Financial assets - fair value R 9 R 12