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Post-retirement benefit obligations - Reconciliation (Details) - Healthcare - Benefit obligation - ZAR (R) R in Millions	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Reconciliation of total post-retirement health care obligation recognized in the statement of financial position
Beginning balance	R 4,243	R 4,163
Movements recognised in the income statement:	485	560
current service cost	66	83
interest cost	420	480
curtailments and settlements	(1)	(3)
Actuarial (gains) losses recognised in other comprehensive income:	(460)	(263)
arising from changes in financial assumptions	(286)	(60)
arising from change in actuarial experience	(174)	(203)
Benefits paid	(181)	(229)
Translation of foreign operations	6	12
Ending balance	4,093	4,243
South Africa
Reconciliation of total post-retirement health care obligation recognized in the statement of financial position
Beginning balance	3,995	3,921
Movements recognised in the income statement:	459	542
current service cost	53	73
interest cost	407	472
curtailments and settlements	(1)	(3)
Actuarial (gains) losses recognised in other comprehensive income:	(468)	(258)
arising from changes in financial assumptions	(293)	(54)
arising from change in actuarial experience	(175)	(204)
Benefits paid	(161)	(210)
Ending balance	3,825	3,995
United States of America
Reconciliation of total post-retirement health care obligation recognized in the statement of financial position
Beginning balance	248	242
Movements recognised in the income statement:	26	18
current service cost	13	10
interest cost	13	8
Actuarial (gains) losses recognised in other comprehensive income:	8	(5)
arising from changes in financial assumptions	7	(6)
arising from change in actuarial experience	1	1
Benefits paid	(20)	(19)
Translation of foreign operations	6	12
Ending balance	R 268	R 248

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

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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
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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

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+ References

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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

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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
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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 [member]]

+ References

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The increase (decrease) in the net defined benefit liability (asset) resulting from past service cost and gains (losses) arising from settlements. [Refer: Gains (losses) arising from settlements, net defined benefit liability (asset); Net defined benefit liability (asset)]

+ 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.

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