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Memorandum items - Additional Information (Details) $ in Millions, $ in Millions | 1 Months Ended | 2 Months Ended | 6 Months Ended | 12 Months Ended | 36 Months Ended | 69 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2023 | Nov. 30, 2022 entity | Dec. 31, 2021 item action | Dec. 31, 2020 GBP (£) | Oct. 31, 2020 GBP (£) | May 31, 2019 item | Jul. 31, 2017 | Jan. 31, 2017 item | Oct. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2023 GBP (£) item action | Dec. 31, 2023 USD ($) item action | Dec. 31, 2022 GBP (£) | Dec. 31, 2021 GBP (£) | Dec. 31, 2018 GBP (£) | Dec. 31, 2015 company | Dec. 31, 2009 | Dec. 31, 2011 USD ($) | 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 | £ |  |  |  |  |  |  |  |  |  |  | £ 264,000,000 |  | £ 266,000,000 | £ 280,000,000 |  |  |  |  |
provisions utilised | £ |  |  |  |  |  |  |  |  |  |  | £ 432,000,000 |  |  |  |  |  |  |  |
Royal Bank of Scotland International Limited | Isle of Man |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation, investigations and reviews |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of non-personal customers | item |  |  |  |  |  |  |  |  |  |  | 2,239 | 2,239 |  |  |  |  |  |  |
Amount of fine payable | £ |  |  |  |  |  |  |  |  |  |  | £ 1,000,000.0 |  |  |  |  |  |  |  |
Maximum | Royal Bank of Scotland International Limited | Isle of Man |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation, investigations and reviews |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of total customer population |  |  |  |  |  |  |  |  |  |  | 3.00% | 3.00% |  |  |  |  |  |  |
Litigation and other regulatory |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation, investigations and reviews |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
provisions utilised | £ |  |  |  |  |  |  |  |  |  |  | £ 63,000,000 |  |  |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation, investigations and reviews |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of non-class action | action |  |  |  |  |  |  |  |  |  |  | 24 |  |  |  |  |  |  |  |
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 | item |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of securities frauds | item |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | item |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |  |  |  |  |
Number of remaining claimant banks | item |  |  |  |  |  |  |  |  |  |  | 19 |  |  |  |  |  |  |  |
Other IBOR cases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation, investigations and reviews |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of class action lawsuits | item |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |
Number of class actions dismissed but appealed | £ |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
Federal Court of Australia FX antitrust litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation, investigations and reviews |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other parties subject to lawsuit or legal investigation | item |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  |  |
Swaps antitrust litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation, investigations and reviews |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of swap execution facilities | item |  |  |  |  |  |  |  |  |  |  | 3 | 3 |  |  |  |  |  |  |
Spoofing litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation, investigations and reviews |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of class action lawsuits | action |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Madoff |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation, investigations and reviews |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of class action lawsuits | action |  |  |  |  |  |  |  |  |  |  | 2 | 2 |  |  |  |  |  |  |
Damages claimed | $ |  |  |  |  |  |  |  |  |  |  |  | $ 298 |  |  |  |  |  |  |
EUA trading litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation, investigations and reviews |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of claimants | company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 |  |  |
Period during which entity is suspected of fraudulent trading |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 days |  |
Damages quantified | £ |  |  |  |  | £ 45,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | £ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | £ 143,000,000 |  |  |  |
Number of branches subject to tax assessment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Payments for tax assessments | £ |  |  |  | £ 143,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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