Related-party transactions - Transactions and balances with related parties (Details) - Rand Refinery - ZAR (R) R in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of transactions between related parties [line items]
Gold sales	R 187	R 319	R 298
Refining fees paid	(24)	(40)	(31)
Trade payable	R (6)	R (7)	R (6)

The amounts payable resulting from related party transactions. [Refer: Related parties [member]]

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The amount of revenue arising from the sale of goods in related party transactions. [Refer: Revenue; Related parties [member]]

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The amount of services received in related party transactions. [Refer: Related parties [member]]

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