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Post-retirement benefit obligations- Loss/(gain) recognition (Details) - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Disclosure of net defined benefit liability (asset) [line items]      
Loss/(gain) recognised in the income statement R 2,240 R 2,073 R 1,897
Loss/(gain) recognised in other comprehensive income (427) (2,415) (834)
Healthcare      
Disclosure of net defined benefit liability (asset) [line items]      
Loss/(gain) recognised in the income statement 477 442 407
Loss/(gain) recognised in other comprehensive income (222) (131) 201
Pension | Benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Loss/(gain) recognised in the income statement 9,310 7,934 7,248
Loss/(gain) recognised in other comprehensive income (1,835) (3,184) 5,715
Pension | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Loss/(gain) recognised in the income statement (8,259) (6,699) (6,115)
Loss/(gain) recognised in other comprehensive income 2,884 (963) (7,062)
Pension | Asset ceiling      
Disclosure of net defined benefit liability (asset) [line items]      
Loss/(gain) recognised in the income statement 712 396 357
Loss/(gain) recognised in other comprehensive income R (1,254) R 1,863 R 312