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Memorandum items - Additional Information (Details) £ in Millions, $ in Millions, $ in Millions | 1 Months Ended | 2 Months Ended | 6 Months Ended | 12 Months Ended | 36 Months Ended | 69 Months Ended
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Nov. 30, 2022 entity | Jul. 31, 2022 action | May 31, 2022 GBP (£) | Dec. 31, 2021 action item | Aug. 31, 2021 action | Dec. 31, 2020 GBP (£) | May 31, 2019 item | Jul. 31, 2017 | Jan. 31, 2017 action | Dec. 31, 2015 | Oct. 31, 2018 item | Dec. 31, 2019 item | Dec. 31, 2024 GBP (£) action item case | Dec. 31, 2024 USD ($) action item | Dec. 31, 2023 GBP (£) | Dec. 31, 2022 GBP (£) | Dec. 31, 2018 GBP (£) company item | Dec. 31, 2011 USD ($) | Oct. 15, 2013 AUD ($)
Litigation, investigations and reviews |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fee income from trustee or other fiduciary activities which is not included in entity's financial statements | £ |  |  |  |  |  |  |  |  |  |  |  |  | £ 302 |  | £ 264 | £ 266 |  |  |
provisions utilised | £ |  |  |  |  |  |  |  |  |  |  |  |  | 428 |  |  |  |  |  |
Litigation and other regulatory |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation, investigations and reviews |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
provisions utilised | £ |  |  |  |  |  |  |  |  |  |  |  |  | £ 35 |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation, investigations and reviews |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of class action lawsuits | action |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 1 |  |  |  |  |
US investigations relating to fixed-income securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation, investigations and reviews |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period during which entity is suspected of fraudulent trading |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 months |  |
Number of wire fraud |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of securities frauds |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of traders conducted trading and breached the NPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |
FDIC | London Interbank Offered Rate (LIBOR) litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation, investigations and reviews |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of failed US banks |  |  |  |  |  |  |  | 39 |  |  |  |  |  |  |  |  |  |  |
Number of banks for which claims have been dropped |  |  |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |  |  |
Number of remaining claimant banks |  |  |  |  |  |  |  |  |  |  |  |  | 19 |  |  |  |  |  |
Other IBOR cases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation, investigations and reviews |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of class action lawsuits | action |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |
Number of class actions dismissed but appealed | case |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Federal Court of Australia FX antitrust litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation, investigations and reviews |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other parties subject to lawsuit or legal investigation |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |
Federal Court of Australia FX antitrust litigation | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation, investigations and reviews |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction value of investigated trades | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.5
UK Competition Appeal Tribunal, FX litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation, investigations and reviews |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of applications for opt-out collective proceedings |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |
Tel Aviv District Court FX antitrust litigations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation, investigations and reviews |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of motions to certify FX-related class actions |  |  |  |  |  |  |  |  |  |  | 2 |  | 1 | 1 |  |  |  |  |
Swaps antitrust litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation, investigations and reviews |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of swap execution facilities |  |  |  |  |  |  |  |  |  |  |  |  | 3 | 3 |  |  |  |  |
Spoofing litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation, investigations and reviews |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of class action lawsuits | action |  | 1 |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Madoff |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation, investigations and reviews |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of class action lawsuits | action |  |  |  |  | 1 |  |  |  |  |  |  |  | 2 | 2 |  |  |  |  |
Damages claimed | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 298 |  |  |  |  |
1MDB litigation | Coutts & Co Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation, investigations and reviews |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other parties subject to lawsuit or legal investigation | entity | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contested amount received and paid out | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 |
Review and investigation of treatment of tracker mortgage customers in Ulster Bank Ireland DAC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation, investigations and reviews |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of FSPO adjudications challenged in court |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |
Offshoring VAT assessments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation, investigations and reviews |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Claimed unpaid VAT after tax assessment | £ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | £ 143 |  |
Number of branches subject to tax assessment | company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |
Payments for tax assessments | £ |  |  | £ 153 |  |  | £ 153 |  |  |  |  |  |  |  |  |  |  |  |  |
Value added tax receivables | £ |  |  |  |  |  |  |  |  |  |  |  |  | £ 153 |  |  |  |  |  |

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