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Post-retirement benefit obligations - Reconciliation (Details) - Healthcare - Benefit obligation - ZAR (R) R in Millions	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Reconciliation of total post-retirement health care obligation recognized in the statement of financial position
Beginning balance	R 4,161	R 3,827
Movements recognised in the income statement:	523	495
current service cost	34	36
interest cost	489	459
Actuarial losses/(gains) recognised in other comprehensive income:	137	137
arising from changes in financial assumptions	222	128
arising from change in actuarial experience	(85)	9
Benefits paid	(307)	(289)
Translation of foreign operations	(6)	(9)
Ending balance	4,508	4,161
South Africa
Reconciliation of total post-retirement health care obligation recognized in the statement of financial position
Beginning balance	3,915	3,567
Movements recognised in the income statement:	499	469
current service cost	22	22
interest cost	477	447
Actuarial losses/(gains) recognised in other comprehensive income:	146	151
arising from changes in financial assumptions	222	138
arising from change in actuarial experience	(76)	13
Benefits paid	(292)	(272)
Ending balance	4,268	3,915
United States of America
Reconciliation of total post-retirement health care obligation recognized in the statement of financial position
Beginning balance	246	260
Movements recognised in the income statement:	24	26
current service cost	12	14
interest cost	12	12
Actuarial losses/(gains) recognised in other comprehensive income:	(9)	(14)
arising from changes in financial assumptions		(10)
arising from change in actuarial experience	(9)	(4)
Benefits paid	(15)	(17)
Translation of foreign operations	(6)	(9)
Ending balance	R 240	R 246

X

- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2024-01-01
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- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from experience adjustments that result in remeasurements of the net defined benefit liability (asset). Experience adjustments deal with the effects of differences between the previous actuarial assumptions and what has actually occurred. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [domain]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)]

+ References

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The increase (decrease) in the net defined benefit liability (asset) resulting from amounts recorded in the income statement in the current period.

+ References

No definition available.

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