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Intangible assets - Schedule of Pre-tax discount rates and terminal growth rates used for impairment testing (Details)	Jun. 30, 2023	Jun. 30, 2022
United States
Disclosure of information for cash-generating units [line items]
Pre-tax discount rate	9.00%	8.00%
Terminal growth rate	2.00%	2.00%
Long-term growth rate	4.00%	4.00%
United Kingdom
Disclosure of information for cash-generating units [line items]
Pre-tax discount rate	9.00%	8.00%
Terminal growth rate	2.00%	2.00%
Long-term growth rate	5.00%	4.00%
Turkey
Disclosure of information for cash-generating units [line items]
Pre-tax discount rate	28.00%	31.00%
Terminal growth rate	16.00%	15.00%
Long-term growth rate	28.00%	25.00%
Australia
Disclosure of information for cash-generating units [line items]
Pre-tax discount rate	10.00%	7.00%
Terminal growth rate	3.00%	2.00%
Long-term growth rate	5.00%	5.00%
Korea
Disclosure of information for cash-generating units [line items]
Pre-tax discount rate	11.00%	7.00%
Terminal growth rate	(2.00%)	2.00%
Long-term growth rate	4.00%	5.00%
India
Disclosure of information for cash-generating units [line items]
Pre-tax discount rate	14.00%	14.00%
Terminal growth rate	4.00%	4.00%
Long-term growth rate	15.00%	11.00%
Greater China
Disclosure of information for cash-generating units [line items]
Pre-tax discount rate	11.00%	7.00%
Terminal growth rate	2.00%	2.00%
Long-term growth rate	6.00%	7.00%
Brazil
Disclosure of information for cash-generating units [line items]
Pre-tax discount rate	16.00%	12.00%
Terminal growth rate	3.00%	3.00%
Long-term growth rate	6.00%	6.00%
Mexico
Disclosure of information for cash-generating units [line items]
Pre-tax discount rate	13.00%	14.00%
Terminal growth rate	3.00%	3.00%
Long-term growth rate	6.00%	6.00%
Africa Emerging Markets
Disclosure of information for cash-generating units [line items]
Pre-tax discount rate	35.00%	12.00%
Terminal growth rate	8.00%	5.00%
Long-term growth rate	18.00%	11.00%
South Africa
Disclosure of information for cash-generating units [line items]
Pre-tax discount rate	20.00%	16.00%
Terminal growth rate	5.00%	0.00%
Long-term growth rate	6.00%	6.00%
Nigeria
Disclosure of information for cash-generating units [line items]
Pre-tax discount rate	35.00%	24.00%
Terminal growth rate	5.00%	12.00%
Long-term growth rate	18.00%	15.00%

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