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Intangible assets - Pre-tax discount rates and terminal growth rates used for impairment testing (Details)
Jun. 30, 2021
Jun. 30, 2020
North America – United States    
Disclosure of information for cash-generating units [line items]    
Pre-tax discount rate 7.00% 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 6.00% 5.00%
Terminal growth rate 2.00% 2.00%
Long-term growth rate 4.00% 4.00%
Spain    
Disclosure of information for cash-generating units [line items]    
Pre-tax discount rate 5.00% 8.00%
Terminal growth rate 2.00% 2.00%
Long-term growth rate 4.00% 3.00%
Turkey    
Disclosure of information for cash-generating units [line items]    
Pre-tax discount rate 22.00% 22.00%
Terminal growth rate 11.00% 11.00%
Long-term growth rate 16.00% 15.00%
Russia    
Disclosure of information for cash-generating units [line items]    
Pre-tax discount rate 12.00% 12.00%
Terminal growth rate 4.00% 3.00%
Long-term growth rate 6.00% 6.00%
South Africa    
Disclosure of information for cash-generating units [line items]    
Pre-tax discount rate 13.00% 18.00%
Terminal growth rate 0.00% 0.00%
Long-term growth rate 6.00% 7.00%
Nigeria    
Disclosure of information for cash-generating units [line items]    
Pre-tax discount rate 19.00% 21.00%
Terminal growth rate 10.00% 11.00%
Long-term growth rate 14.00% 14.00%
Africa Emerging Markets    
Disclosure of information for cash-generating units [line items]    
Pre-tax discount rate 22.00% 26.00%
Terminal growth rate 4.00% 5.00%
Long-term growth rate 10.00% 11.00%
Brazil    
Disclosure of information for cash-generating units [line items]    
Pre-tax discount rate 11.00% 15.00%
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 17.00% 16.00%
Terminal growth rate 3.00% 3.00%
Long-term growth rate 6.00% 5.00%
Korea    
Disclosure of information for cash-generating units [line items]    
Pre-tax discount rate 10.00% 10.00%
Terminal growth rate (4.00%) (4.00%)
Long-term growth rate 0.00% 0.00%
India    
Disclosure of information for cash-generating units [line items]    
Pre-tax discount rate 12.00% 12.00%
Terminal growth rate 4.00% 4.00%
Long-term growth rate 11.00% 12.00%
Global Travel    
Disclosure of information for cash-generating units [line items]    
Pre-tax discount rate 7.00% 8.00%
Terminal growth rate 2.00% 2.00%
Long-term growth rate 5.00% 5.00%