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Financial risk management and financial instruments - Expected Credit Losses (Details) - ZAR (R)
R in Millions
Jun. 30, 2023
Jun. 30, 2022
Detail on expected credit losses recognised    
Financial assets R (92,029) R (87,991)
Receivables | Impairment    
Detail on expected credit losses recognised    
Financial assets 863 547
Receivables | Lifetime | Impairment    
Detail on expected credit losses recognised    
Financial assets 797 445
Receivables | Lifetime | Impairment | Significant increase in credit risk since initial recognition    
Detail on expected credit losses recognised    
Financial assets 102 1
Receivables | Lifetime | Impairment | Simplified approach for trade receivables    
Detail on expected credit losses recognised    
Financial assets 34 30
Receivables | Lifetime | Impairment | Credit impaired    
Detail on expected credit losses recognised    
Financial assets 661 414
Receivables | 12-months | Impairment    
Detail on expected credit losses recognised    
Financial assets 66 102
Long-term receivables    
Detail on expected credit losses recognised    
Financial assets R (2,803) R (3,023)
Long-term receivables | AAA to A-    
Detail on expected credit losses recognised    
Percentage of financial assets at amortised cost 29.00% 51.00%
Long-term receivables | BBB to B-    
Detail on expected credit losses recognised    
Percentage of financial assets at amortised cost 59.00% 43.00%
Long-term receivables | CCC+ and below    
Detail on expected credit losses recognised    
Percentage of financial assets at amortised cost 12.00% 6.00%
Long-term receivables | Impairment    
Detail on expected credit losses recognised    
Financial assets R 111 R 85
Long-term receivables | Lifetime | Impairment    
Detail on expected credit losses recognised    
Financial assets 49 41
Long-term receivables | Lifetime | Impairment | Credit impaired    
Detail on expected credit losses recognised    
Financial assets 49 41
Long-term receivables | 12-months | Impairment    
Detail on expected credit losses recognised    
Financial assets R 62 R 44
Trade receivable | AAA to A-    
Detail on expected credit losses recognised    
Percentage of financial assets at amortised cost 77.00% 73.00%
Trade receivable | BBB to B-    
Detail on expected credit losses recognised    
Percentage of financial assets at amortised cost 18.00% 24.00%
Trade receivable | CCC+ and below    
Detail on expected credit losses recognised    
Percentage of financial assets at amortised cost 5.00% 3.00%
Trade receivable | Impairment    
Detail on expected credit losses recognised    
Financial assets R 261 R 131
Trade receivable | Lifetime | Impairment    
Detail on expected credit losses recognised    
Financial assets 261 131
Trade receivable | Lifetime | Impairment | Simplified approach for trade receivables    
Detail on expected credit losses recognised    
Financial assets 34 30
Trade receivable | Lifetime | Impairment | Credit impaired    
Detail on expected credit losses recognised    
Financial assets R 227 R 101
Other receivables | AAA to A-    
Detail on expected credit losses recognised    
Percentage of financial assets at amortised cost 82.00% 83.00%
Other receivables | BBB to B-    
Detail on expected credit losses recognised    
Percentage of financial assets at amortised cost 15.00% 15.00%
Other receivables | CCC+ and below    
Detail on expected credit losses recognised    
Percentage of financial assets at amortised cost 3.00% 2.00%
Other receivables | Impairment    
Detail on expected credit losses recognised    
Financial assets R 491 R 331
Other receivables | Lifetime | Impairment    
Detail on expected credit losses recognised    
Financial assets 487 273
Other receivables | Lifetime | Impairment | Significant increase in credit risk since initial recognition    
Detail on expected credit losses recognised    
Financial assets 102 1
Other receivables | Lifetime | Impairment | Credit impaired    
Detail on expected credit losses recognised    
Financial assets 385 272
Other receivables | 12-months | Impairment    
Detail on expected credit losses recognised    
Financial assets 4 58
Cash and cash equivalents    
Detail on expected credit losses recognised    
Financial assets R (53,926) R (43,140)
Cash and cash equivalents | AAA to A-    
Detail on expected credit losses recognised    
Percentage of financial assets at amortised cost 20.00% 18.00%
Cash and cash equivalents | BBB to B-    
Detail on expected credit losses recognised    
Percentage of financial assets at amortised cost 78.00% 81.00%
Cash and cash equivalents | CCC+ and below    
Detail on expected credit losses recognised    
Percentage of financial assets at amortised cost 2.00% 1.00%