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Post-retirement benefit obligations - Investments Target Allocation (Details) - Pension R in Millions	Jun. 30, 2018 ZAR (R) age item
Pension benefits
Number of investment portfolios members can choose from | item	4
Plan assets at fair value - Low risk portfolio	R 146
Plan assets at fair value - Moderate balanced portfolio	47,929
Plan assets at fair value - Aggressive balanced portfolio	700
Plan assets at fair value - Money market portfolio	R 678
Minimum
Pension benefits
Age of participant for money market portfolio | age	55
South Africa | Minimum
Pension benefits
Target allocation, equity- local (as a percent)	30.00%
Target allocation, equity- foreign (as a percent)	15.00%
Target allocation, Fixed Interest (as a percent)	5.00%
Target allocation, Property (as a percent)	10.00%
South Africa | Maximum
Pension benefits
Target allocation, equity- local (as a percent)	45.00%
Target allocation, equity- foreign (as a percent)	30.00%
Target allocation, Fixed Interest (as a percent)	25.00%
Target allocation, Property (as a percent)	25.00%
Target allocation, Other (as a percent)	15.00%
United States of America | Minimum
Pension benefits
Target allocation, equity- local (as a percent)	17.00%
Target allocation, equity- foreign (as a percent)	17.00%
Target allocation, Fixed Interest (as a percent)	55.00%
United States of America | Maximum
Pension benefits
Target allocation, equity- local (as a percent)	37.00%
Target allocation, equity- foreign (as a percent)	37.00%
Target allocation, Fixed Interest (as a percent)	75.00%
Target allocation, Property (as a percent)	18.00%
Target allocation, Other (as a percent)	18.00%

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The minimum age of participants in the Money Market Portfolio.

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The number of investment portfolios members can choose from.

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The fair value of defined benefit plan assets held in the Aggressive Balanced Portfolio. Plan assets comprise assets held by a long-term employee benefit fund.

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The fair value of defined benefit plan assets held in the Low Risk Portfolio. Plan assets comprise assets held by a long-term employee benefit fund.

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The fair value of defined benefit plan assets held in the Moderate Balanced Portfolio. Plan assets comprise assets held by a long-term employee benefit fund.

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The fair value of defined benefit plan assets held in the Money Market Portfolio. Plan assets comprise assets held by a long-term employee benefit fund.

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The target allocation percentage for the Fixed Interest category of plan assets as of the latest statement of financial position presented (on a weighted-average basis for employers with more than one plan) that is incorporated in the plan's investment policies and strategies.

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The target allocation percentage for the Equity - foreign category of plan assets as of the latest statement of financial position presented (on a weighted-average basis for employers with more than one plan) that is incorporated in the plan's investment policies and strategies.

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The target allocation percentage for the Equity - local category of plan assets as of the latest statement of financial position presented (on a weighted-average basis for employers with more than one plan) that is incorporated in the plan's investment policies and strategies.

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The target allocation percentage for the Other category of plan assets as of the latest statement of financial position presented (on a weighted-average basis for employers with more than one plan) that is incorporated in the plan's investment policies and strategies.

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The target allocation percentage for the Property category of plan assets as of the latest statement of financial position presented (on a weighted-average basis for employers with more than one plan) that is incorporated in the plan's investment policies and strategies.

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