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Litigation and regulatory matters (Details) £ in Millions, $ in Millions, $ in Millions | 1 Months Ended | 6 Months Ended | 12 Months Ended | 36 Months Ended |  |
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Nov. 30, 2023 item | Jun. 30, 2023 item | Nov. 30, 2022 item | Jul. 31, 2022 action | May 31, 2022 GBP (£) | Dec. 31, 2021 item | Aug. 31, 2021 action | Dec. 31, 2020 GBP (£) | Dec. 31, 2019 item | Jul. 31, 2019 item | May 31, 2019 AUD ($) item | Oct. 31, 2018 item | Sep. 30, 2018 item | Jul. 31, 2017 item | Jun. 30, 2025 USD ($) lawsuit item action | Dec. 31, 2021 action | Dec. 31, 2018 GBP (£) item | Dec. 31, 2011 USD ($) | Jun. 30, 2025 GBP (£) item case | Dec. 31, 2024 GBP (£)
Litigation and regulatory matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial Assets | £ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | £ 730,778 | £ 707,985
London Interbank Offered Rate (LIBOR) litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation and regulatory matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of class action lawsuits | lawsuit |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
US investigations relating to fixed-income securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation and regulatory matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of wire fraud |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of securities frauds |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period during which entity is suspected of fraudulent trading |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 months |  |  |
Number of traders conducted trading and breached the NPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |
FDIC | Litigation and regulatory matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation and regulatory matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of failed US banks |  |  |  |  |  |  |  |  |  |  |  |  |  | 39 |  |  |  |  |  |
Number of banks for which claims have been dropped |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 |
Number of remaining claimant banks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19 |
Other LIBOR cases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation and regulatory matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of class action lawsuits | action |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |
Other IBOR cases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation and regulatory matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of class actions dismissed but appealed | case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Federal Court of Australia FX antitrust litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation and regulatory matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other parties subject to lawsuit or legal investigation |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |
Federal Court of Australia FX antitrust litigation | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation and regulatory matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction value of investigated trades | $ |  |  |  |  |  |  |  |  |  |  | $ 0.5 |  |  |  |  |  |  |  |  |
UK Competition Appeal Tribunal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation and regulatory matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of applications for opt-out collective proceedings | 2 |  |  |  |  |  |  |  | 2 | 2 |  |  |  |  |  |  |  |  |  |
Tel Aviv District Court FX antitrust litigations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation and regulatory matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of motions to certify FX-related class actions |  |  |  |  |  |  |  |  |  |  |  | 2 | 2 |  |  |  |  |  |  |
Number of pending motions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |
Swaps antitrust litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation and regulatory matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of swap execution facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |
Spoofing litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation and regulatory matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of class action lawsuits | action |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |
Madoff |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation and regulatory matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of class action lawsuits | action |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  | 2 |  |  |  |  |
Damages claimed | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300 |  |  |  |  |
Offshoring VAT assessments | HMRC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation and regulatory matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Claimed unpaid VAT after tax assessment | £ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | £ 143 |  |  |
Number of branches subject to tax assessment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |
Payments for tax assessments | £ |  |  |  |  | £ 153 |  |  | £ 153 |  |  |  |  |  |  |  |  |  |  |  |
Offshoring VAT assessments | Recoverable deposit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation and regulatory matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial Assets | £ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | £ 153 |
1MDB litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation and regulatory matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Funds received and paid out, subject to alleged breach of fiduciary duties and lack of due diligence | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |
1MDB litigation | Coutts & Co Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation and regulatory matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other parties subject to lawsuit or legal investigation |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Review and investigation of treatment of tracker mortgage customers in Ulster Bank Ireland DAC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation and regulatory matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of FSPO adjudications challenged in court |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of outstanding cases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |

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