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Contingent liabilities and legal proceedings - Continuing matters relating to Dr Vijay Mallya and affiliales (Details)
$ in Millions
 12 Months Ended 60 Months Ended
May 23, 2019
USD ($)
Nov. 16, 2017
USD ($)
instalment
Feb. 25, 2016
USD ($)
instalment
Jun. 30, 2024
Dec. 31, 2021
25 February agreement          
Disclosure of contingent liabilities [line items]          
Number of instalments | instalment     5    
Dr Mallya | 25 February agreement          
Disclosure of contingent liabilities [line items]          
Committed payment relating to disengagement agreements     $ 75    
Consideration payment period     5 years   5 years
Payment relating to disengagement agreements     $ 40    
Amount payable in equal installments to Dr Mallya     7    
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      
Continental Administration Services Limited (CASL)          
Disclosure of contingent liabilities [line items]          
Damages awarded, co-surety percentage       50.00%