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Post-retirement benefit obligations - Reconciliation, projected net pension liability (Details) - ZAR (R) R in Millions	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Disclosure of net defined benefit liability (asset)
Increase in asset limitation	R 58	R 1,051	R (105)
Pension
Disclosure of net defined benefit liability (asset)
Net post-retirement obligation (asset) recognized	7,740	6,548
Benefit obligation | Pension
Disclosure of net defined benefit liability (asset)
Net post-retirement obligation (asset) recognized	63,806	58,305	56,282
Benefit obligation | Unfunded benefit obligation | Pension
Disclosure of net defined benefit liability (asset)
Net post-retirement obligation (asset) recognized	8,868	7,915
Benefit obligation | Funded benefit obligation | Pension
Disclosure of net defined benefit liability (asset)
Net post-retirement obligation (asset) recognized	54,938	50,390
Benefit obligation | Funded benefit obligation | Pension - Defined benefit portion
Disclosure of net defined benefit liability (asset)
Net post-retirement obligation (asset) recognized	25,247	23,075
Benefit obligation | Funded benefit obligation | Pension - Defined benefit option
Disclosure of net defined benefit liability (asset)
Net post-retirement obligation (asset) recognized	29,691	27,315
Plan assets | Pension
Disclosure of net defined benefit liability (asset)
Net post-retirement obligation (asset) recognized	(58,385)	(54,018)	(50,854)
Plan assets | Pension - Defined benefit portion
Disclosure of net defined benefit liability (asset)
Net post-retirement obligation (asset) recognized	(28,524)	(26,392)
Plan assets | Pension - Defined benefit option
Disclosure of net defined benefit liability (asset)
Net post-retirement obligation (asset) recognized	(29,861)	(27,626)
Asset ceiling | Pension
Disclosure of net defined benefit liability (asset)
Net post-retirement obligation (asset) recognized	2,319	2,261
Increase in asset limitation	58	1,051
South Africa | Pension
Disclosure of net defined benefit liability (asset)
Net post-retirement obligation (asset) recognized	(555)	(582)
South Africa | Benefit obligation | Pension
Disclosure of net defined benefit liability (asset)
Net post-retirement obligation (asset) recognized	51,241	47,285	46,508
South Africa | Benefit obligation | Funded benefit obligation | Pension
Disclosure of net defined benefit liability (asset)
Net post-retirement obligation (asset) recognized	51,241	47,285
South Africa | Benefit obligation | Funded benefit obligation | Pension - Defined benefit portion
Disclosure of net defined benefit liability (asset)
Net post-retirement obligation (asset) recognized	21,550	19,970
South Africa | Benefit obligation | Funded benefit obligation | Pension - Defined benefit option
Disclosure of net defined benefit liability (asset)
Net post-retirement obligation (asset) recognized	29,691	27,315
South Africa | Plan assets | Pension
Disclosure of net defined benefit liability (asset)
Net post-retirement obligation (asset) recognized	(54,115)	(50,128)	(48,340)
South Africa | Plan assets | Pension - Defined benefit portion
Disclosure of net defined benefit liability (asset)
Net post-retirement obligation (asset) recognized	(24,254)	(22,502)
South Africa | Plan assets | Pension - Defined benefit option
Disclosure of net defined benefit liability (asset)
Net post-retirement obligation (asset) recognized	(29,861)	(27,626)
South Africa | Asset ceiling | Pension
Disclosure of net defined benefit liability (asset)
Net post-retirement obligation (asset) recognized	2,319	2,261
Foreign Countries | Pension
Disclosure of net defined benefit liability (asset)
Net post-retirement obligation (asset) recognized	8,295	7,130
Foreign Countries | Benefit obligation | Pension
Disclosure of net defined benefit liability (asset)
Net post-retirement obligation (asset) recognized	12,565	11,020	9,774
Foreign Countries | Benefit obligation | Unfunded benefit obligation | Pension
Disclosure of net defined benefit liability (asset)
Net post-retirement obligation (asset) recognized	8,868	7,915
Foreign Countries | Benefit obligation | Funded benefit obligation | Pension
Disclosure of net defined benefit liability (asset)
Net post-retirement obligation (asset) recognized	3,697	3,105
Foreign Countries | Benefit obligation | Funded benefit obligation | Pension - Defined benefit portion
Disclosure of net defined benefit liability (asset)
Net post-retirement obligation (asset) recognized	3,697	3,105
Foreign Countries | Plan assets | Pension
Disclosure of net defined benefit liability (asset)
Net post-retirement obligation (asset) recognized	(4,270)	(3,890)	R (2,514)
Foreign Countries | Plan assets | Pension - Defined benefit portion
Disclosure of net defined benefit liability (asset)
Net post-retirement obligation (asset) recognized	R (4,270)	R (3,890)

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from the gain (loss) on changes in the effect of limiting a net defined benefit asset to the asset ceiling, excluding amounts included in interest income or expense. [Refer: Interest income; Net defined benefit liability (asset); Interest expense (income), net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2018-01-01
-Paragraph 141
-Subparagraph c
-Clause iv
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_c_iv&doctype=Standard
-URIDate 2018-03-16

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- Definition

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2018-01-01
-Paragraph 140
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_140_a&doctype=Standard
-URIDate 2018-03-16

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