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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 (£)
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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

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