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Post-retirement benefit obligations - Reconciliation Plan Assets, RF, Contributions (Details) - Pension R in Millions, $ in Millions | 12 Months Ended
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Jun. 30, 2019 ZAR (R) | Jun. 30, 2018 USD ($) | Jun. 30, 2018 ZAR (R)
Disclosure of net defined benefit liability (asset) |  |  |
Beginning balance | R (6,548) |  |
Ending balance | (7,740) |  | R (6,548)
Plan assets |  |  |
Disclosure of net defined benefit liability (asset) |  |  |
Beginning balance | 54,018 |  | 50,854
Movements recognised in the income statement: | 4,815 |  | 4,774
interest expense (income) | 5,040 |  | 4,896
interest on asset limitation | (225) |  | (122)
Actuarial gains (losses) recognised in other comprehensive income: | 514 |  | (1,779)
Return on plan assets | 514 |  | (1,779)
Member contributions | 482 |  | 447
Employer contribution | 1,062 |  | 2,224
Benefits paid | (2,603) |  | (2,712)
Translation of foreign operations | 97 |  | 210
Ending balance | 58,385 |  | 54,018
Actual return on plan assets | 5,329 |  | 2,995
South Africa |  |  |
Disclosure of net defined benefit liability (asset) |  |  |
Beginning balance | 582 |  |
Ending balance | 555 |  | 582
South Africa | Funded benefit obligation |  |  |
Disclosure of net defined benefit liability (asset) |  |  |
Projected pension contributions for next fiscal year | 1,106 |  |
South Africa | Plan assets |  |  |
Disclosure of net defined benefit liability (asset) |  |  |
Beginning balance | 50,128 |  | 48,340
Movements recognised in the income statement: | 4,702 |  | 4,707
interest expense (income) | 4,927 |  | 4,829
interest on asset limitation | (225) |  | (122)
Actuarial gains (losses) recognised in other comprehensive income: | 229 |  | (1,959)
Return on plan assets | 229 |  | (1,959)
Member contributions | 482 |  | 447
Employer contribution | 1,056 |  | 991
Benefits paid | (2,482) |  | (2,398)
Ending balance | 54,115 |  | 50,128
Actual return on plan assets | 4,931 |  | 2,748
Foreign Countries |  |  |
Disclosure of net defined benefit liability (asset) |  |  |
Beginning balance | (7,130) |  |
Ending balance | (8,295) |  | (7,130)
Foreign Countries | Funded benefit obligation |  |  |
Disclosure of net defined benefit liability (asset) |  |  |
Projected pension contributions for next fiscal year | 120 |  |
Foreign Countries | Plan assets |  |  |
Disclosure of net defined benefit liability (asset) |  |  |
Beginning balance | 3,890 |  | 2,514
Movements recognised in the income statement: | 113 |  | 67
interest expense (income) | 113 |  | 67
Actuarial gains (losses) recognised in other comprehensive income: | 285 |  | 180
Return on plan assets | 285 |  | 180
Employer contribution | 6 |  | 1,233
Benefits paid | (121) |  | (314)
Translation of foreign operations | 97 |  | 210
Ending balance | 4,270 |  | 3,890
Actual return on plan assets | R 398 |  | 247
United States of America | Plan assets |  |  |
Disclosure of net defined benefit liability (asset) |  |  |
Once-off payment made by the employer to the fund |  | $ 75 | R 963

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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan by plan participants. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_f&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 147 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_147_b&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 148 -Subparagraph d -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_148_d_iii&doctype=Standard -URIDate 2018-03-16 + Details
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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 -Number 19 -IssueDate 2018-01-01 -Paragraph 141 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_b&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets, excluding amounts included in interest income or expense. The return on plans assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]; 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 i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_c_i&doctype=Standard -URIDate 2018-03-16 + Details
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