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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% |

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