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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
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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% |  |  |  |

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