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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) - 25 February agreement £ in Millions, $ in Millions | Mar. 12, 2018 instalment | Nov. 16, 2017 USD ($) | Nov. 16, 2017 GBP (£) | Feb. 25, 2016 USD ($) | Feb. 25, 2016 GBP (£) | Feb. 25, 2016 GBP (£)
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Dr Mallya |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Committed payment relating to disengagement agreements |  |  |  | $ 75 | £ 63 |
Consideration payment period |  |  |  | 5 years | 5 years |
Amount paid relating to disengagement agreements |  |  |  | $ 40 | £ 33 |
Amount payable relating to disengagement agreements in equal installments |  |  |  | 7 |  | £ 6
Repayment demanded of original amount paid |  |  |  | 40 | 33 |
Number Of Disputed Instalments | 2 |  |  |  |  |
Watson Limited |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Release of obligations to indemnify under guarantee of certain borrowings |  |  |  | $ 141 | £ 118 |
Damages related to breach of associated security documents |  | $ 142 | £ 118 |  |  |

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