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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)
$ in Millions
May 23, 2019
USD ($)
Mar. 12, 2018
instalment
Nov. 16, 2017
USD ($)
Feb. 25, 2016
USD ($)
Nov. 09, 2012
Petition
SPA | UBHL          
Disclosure of contingent liabilities [line items]          
Number of pending winding-up petitions | Petition         5
Dr Mallya | 25 February agreement          
Disclosure of contingent liabilities [line items]          
Committed payment relating to disengagement agreements       $ 75  
Consideration payment period       5 years  
Amount paid relating to disengagement agreements       $ 40  
Amount payable relating to disengagement agreements in equal installments       7  
Repayment demanded of original amount paid       40  
Number Of Disputed Instalments | instalment   2      
Watson Limited          
Disclosure of contingent liabilities [line items]          
Damages awarded $ 135        
Watson Limited | 25 February agreement          
Disclosure of contingent liabilities [line items]          
Release of obligations to indemnify under guarantee of certain borrowings       $ 141  
Damages related to breach of associated security documents     $ 142    
CASL          
Disclosure of contingent liabilities [line items]          
Damages awarded, co-surety percentage 50.00%