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Post-retirement benefit obligations - Reconciliation Plan Assets, RF, Contributions (Details) - Pension R in Millions, $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2018 ZAR (R) | Jun. 30, 2017 ZAR (R)
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Beginning balance |  | R (6,638) |
Ending balance |  | (6,548) | R (6,638)
Plan assets |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Beginning balance |  | 50,854 | 49,191
Movements recognised in the income statement: |  | 4,774 | 4,465
interest expense (income) |  | 4,896 | 4,593
interest on asset limitation |  | (122) | (128)
Actuarial gains (losses) recognised in other comprehensive income: |  | (1,779) | (1,728)
Return on plan assets |  | (1,779) | (1,728)
Member contributions |  | 447 | 411
Employer contribution |  | 2,224 | 1,165
Benefits paid |  | (2,712) | (2,365)
Translation of foreign operations |  | 210 | (285)
Ending balance |  | 54,018 | 50,854
Actual return on plan assets |  | 2,995 | 2,737
South Africa |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Beginning balance |  | 622 |
Ending balance |  | 582 | 622
Projected pension contributions for next fiscal year |  | 1,009 |
South Africa | Plan assets |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Beginning balance |  | 48,340 | 46,752
Movements recognised in the income statement: |  | 4,707 | 4,407
interest expense (income) |  | 4,829 | 4,535
interest on asset limitation |  | (122) | (128)
Actuarial gains (losses) recognised in other comprehensive income: |  | (1,959) | (1,930)
Return on plan assets |  | (1,959) | (1,930)
Member contributions |  | 447 | 411
Employer contribution |  | 991 | 900
Benefits paid |  | (2,398) | (2,200)
Ending balance |  | 50,128 | 48,340
Actual return on plan assets |  | 2,748 | 2,477
Foreign Countries |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Beginning balance |  | (7,260) |
Ending balance |  | (7,130) | (7,260)
Projected pension contributions for next fiscal year |  | 287 |
Foreign Countries | Plan assets |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Beginning balance |  | 2,514 | 2,439
Movements recognised in the income statement: |  | 67 | 58
interest expense (income) |  | 67 | 58
Actuarial gains (losses) recognised in other comprehensive income: |  | 180 | 202
Return on plan assets |  | 180 | 202
Employer contribution |  | 1,233 | 265
Benefits paid |  | (314) | (165)
Translation of foreign operations |  | 210 | (285)
Ending balance |  | 3,890 | 2,514
Actual return on plan assets |  | 247 | R 260
United States of America | Plan assets |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Once-off payment made by the employer to the fund | $ 75 | R 963 |

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- Definition The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [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 2017-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_f&doctype=Standard -URIDate 2017-03-09 + Details
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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 2017-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_f&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 147 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_147_b&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 148 -Subparagraph d -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_148_d_iii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition 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 -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_e&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 141 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets. 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]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_c_i&doctype=Standard -URIDate 2017-03-09 + Details
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