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Contingent liabilities and legal proceedings - Other continuing matters relating to Dr Mallya and affiliates (Details)
£ in Millions, $ in Millions
May 24, 2019
USD ($)
May 24, 2019
GBP (£)
May 23, 2019
Nov. 16, 2017
USD ($)
Nov. 16, 2017
GBP (£)
Watson Limited          
Disclosure of contingent liabilities [line items]          
Damages awarded $ 135 £ 113      
CASL          
Disclosure of contingent liabilities [line items]          
Damages awarded, co-surety percentage     50.00%    
25 February agreement | Watson Limited          
Disclosure of contingent liabilities [line items]          
Damages claimed       $ 142 £ 118