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Post-retirement benefit obligations - Reconciliation, projected net pension liability (Details) - ZAR (R) R in Millions | 12 Months Ended
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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) |

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