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Contingent liabilities and legal proceedings - Continuing matters relating to the resignation of Dr Vijay Mallya from USL and USL internal inquiries (Details) - 25 February agreement
£ in Millions, $ in Millions
 48 Months Ended
Mar. 12, 2018
instalment
Nov. 16, 2017
USD ($)
Nov. 16, 2017
GBP (£)
Feb. 25, 2016
USD ($)
Feb. 25, 2016
GBP (£)
Feb. 25, 2021
instalment
Feb. 25, 2016
GBP (£)
Disclosure of contingent liabilities [line items]              
Number Of Instalments Due           5  
Dr Mallya              
Disclosure of contingent liabilities [line items]              
Global non-compete, non-interference, non-solicitation and standstill commitments term       5 years 5 years    
Committed payment relating to disengagement agreements       $ 75 £ 53    
Consideration payment period       5 years 5 years    
Amount paid relating to disengagement agreements       $ 40 £ 28    
Amount payable relating to disengagement agreements in equal installments       7     £ 5
Installments relating to disengagement agreements, not liable to pay due to breaches of several provisions       7 5    
Repayment demanded of original amount paid       40 28    
Number Of Disputed Instalments 2            
Watson Limited              
Disclosure of contingent liabilities [line items]              
Release of obligations to indemnify under guarantee of certain borrowings       $ 141 96    
Damages related to breach of associated security documents   $ 142 £ 105        
United Breweries Overseas Limited              
Disclosure of contingent liabilities [line items]              
Release of obligations to indemnify under guarantee of certain borrowings | £         £ 30