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Contingent liabilities and legal proceedings - Tax (Details)
£ in Millions
Dec. 31, 2021
GBP (£)
India  
Disclosure of contingent liabilities [line items]  
Receivable for protest payments £ 102
Receivable for protest payments, corporate taxes 92
Receivable for protest payments, indirect taxes 10
Tax contingent liability | Maximum | Brazil  
Disclosure of contingent liabilities [line items]  
Potential liability 439
Tax contingent liability | Maximum | India  
Disclosure of contingent liabilities [line items]  
Potential liability £ 124