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Contingent liabilities and legal proceedings - Continuing matters relating to Dr Vijay Mallya and affiliales (Details)
£ in Millions, $ in Millions
 12 Months Ended 60 Months Ended
May 23, 2019
USD ($)
May 23, 2019
GBP (£)
Nov. 16, 2017
USD ($)
instalment
Nov. 16, 2017
GBP (£)
instalment
Feb. 25, 2016
USD ($)
instalment
Feb. 25, 2016
GBP (£)
instalment
Jun. 30, 2022
Dec. 31, 2021
Feb. 25, 2016
GBP (£)
25 February agreement                  
Disclosure of contingent liabilities [line items]                  
Number of instalments         5 5      
Dr Mallya | 25 February agreement                  
Disclosure of contingent liabilities [line items]                  
Payment relating to disengagement agreements         $ 75 £ 62      
Consideration payment period         5 years 5 years   5 years  
Payment relating to disengagement agreements         $ 40 £ 33      
Amount payable in equal installments to Dr Mallya         7       £ 6
Number of disputed instalments     2 2          
Watson Limited                  
Disclosure of contingent liabilities [line items]                  
Damages awarded $ 135 £ 112              
Watson Limited | 25 February agreement                  
Disclosure of contingent liabilities [line items]                  
Release of obligations to indemnify under guarantee of certain borrowings         $ 141 £ 117      
Damages related to breach of associated security documents     $ 142 £ 117          
Continental Administration Services Limited (CASL)                  
Disclosure of contingent liabilities [line items]                  
Damages awarded, co-surety percentage             50.00%