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Post-retirement benefit obligations- Loss/(gain) recognition (Details) - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2023
Disclosure of net defined benefit liability (asset) [line items]      
Loss/(gain) recognised in the income statement R 2,363 R 2,324 R 2,240
Loss/(gain) recognised in other comprehensive income (251) (55) (427)
Healthcare      
Disclosure of net defined benefit liability (asset) [line items]      
Loss/(gain) recognised in the income statement 523 495 477
Loss/(gain) recognised in other comprehensive income 137 137 (222)
Pension | Benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Loss/(gain) recognised in the income statement 10,836 10,162 9,310
Loss/(gain) recognised in other comprehensive income 1,819 2,081 (1,835)
Pension | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Loss/(gain) recognised in the income statement (9,640) (8,998) (8,259)
Loss/(gain) recognised in other comprehensive income (1,559) (3,575) 2,884
Pension | Asset ceiling      
Disclosure of net defined benefit liability (asset) [line items]      
Loss/(gain) recognised in the income statement 644 665 712
Loss/(gain) recognised in other comprehensive income R (648) R 1,302 R (1,254)