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Post-retirement benefit obligations- Loss/(gain) recognition (Details) - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Disclosure of net defined benefit liability (asset) [line items]      
Loss/(gain) recognised in the income statement R 2,324 R 2,240 R 2,073
Loss/(gain) recognised in other comprehensive income (55) (427) (2,415)
Healthcare      
Disclosure of net defined benefit liability (asset) [line items]      
Loss/(gain) recognised in the income statement 495 477 442
Loss/(gain) recognised in other comprehensive income 137 (222) (131)
Pension | Benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Loss/(gain) recognised in the income statement 10,162 9,310 7,934
Loss/(gain) recognised in other comprehensive income 2,081 (1,835) (3,184)
Pension | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Loss/(gain) recognised in the income statement (8,998) (8,259) (6,699)
Loss/(gain) recognised in other comprehensive income (3,575) 2,884 (963)
Pension | Asset ceiling      
Disclosure of net defined benefit liability (asset) [line items]      
Loss/(gain) recognised in the income statement 665 712 396
Loss/(gain) recognised in other comprehensive income R 1,302 R (1,254) R 1,863