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Memorandum items - Other (Details) € in Millions, £ in Millions, $ in Millions, $ in Millions | 1 Months Ended | 2 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2021 GBP (£) item action | Dec. 31, 2021 USD ($) item action | Dec. 31, 2021 EUR (€) item action | Dec. 31, 2020 GBP (£) | Oct. 31, 2020 GBP (£) | May 31, 2019 AUD ($) | Mar. 31, 2019 USD ($) | Oct. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2021 GBP (£) action item | Dec. 31, 2021 USD ($) action item | Dec. 31, 2021 EUR (€) action item | Dec. 31, 2020 GBP (£) | Dec. 31, 2019 GBP (£) | Dec. 31, 2015 USD ($) company | Dec. 31, 2018 GBP (£) | Jul. 31, 2017 item | Jan. 31, 2017
Trustee and other fiduciary activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fee income |  |  |  |  |  |  |  |  |  | £ 280.0 |  |  | £ 245.0 | £ 250.0 |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional Provisions |  |  |  |  |  |  |  |  |  | 789.0 |  |  |  |  |  |  |  |
Provisions utilised |  |  |  |  |  |  |  |  |  | 967.0 |  |  |  |  |  |  |  |
Legal proceedings provision [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional Provisions |  |  |  |  |  |  |  |  |  | 307.0 |  |  |  |  |  |  |  |
Provisions utilised |  |  |  |  |  |  |  |  |  | 309.0 |  |  |  |  |  |  |  |
Treatment of tracker mortgage customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional Provisions |  |  |  |  |  |  |  |  |  | 300.0 |  | € 358.0 |  |  |  |  |  |
Provisions utilised |  |  |  |  |  |  |  |  |  | 281.0 |  | 335.0 |  |  |  |  |  |
Internal review from treatment of tracker mortgage customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional Provisions |  |  |  |  |  |  |  |  |  | 158.0 |  | 188.0 |  |  |  |  |  |
Provisions utilised |  |  |  |  |  |  |  |  |  | £ 131.0 |  | € 156.0 |  |  |  |  |  |
Litigation and regulatory matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of failed US banks | item |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 39 |
Foreign exchange related investigations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fines received | € |  |  | € 32.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
US investigations relating to fixed-income securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of years probation | 3 years | 3 years | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of wire fraud | item | 1 | 1 | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of securities frauds | item | 1 | 1 | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Penalty paid for criminal fines | $ |  | $ 25.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Penalty paid for criminal forfeiture | $ |  | 2.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Penalty paid for restitution | $ |  | $ 6.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential mortgage-backed securities (RMBS) litigation in the US, issued by Nomura Holding America Inc and subsidiaries | New Jersey Carpenters Health Fund | NWMSI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation, investigations and reviews |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreed settlement amount | $ |  |  |  |  |  |  | $ 55.3 |  |  |  |  |  |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of non-class action | action | 24 | 24 | 24 |  |  |  |  |  |  | 24 | 24 | 24 |  |  |  |  |  |
JPY LIBOR and Euroyen TIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of class action lawsuits | 2 | 2 | 2 |  |  |  |  |  |  | 2 | 2 | 2 |  |  |  |  |  |
Other LIBOR cases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of class action lawsuits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5
FX antitrust litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement amount paid | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 255.0 |  |  |
Federal Court of Australia FX antitrust litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other parties subject to lawsuit or legal investigation |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |
Maximum Total Transaction Value | $ |  |  |  |  |  | $ 0.5 |  |  |  |  |  |  |  |  |  |  |  |
UK Competition Appeal Tribunal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of applications for opt-out collective proceedings |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Tel Aviv District Court FX antitrust litigations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of motions to certify FX-related class actions |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |
Tel Aviv District Court FX antitrust litigations | NatWest Markets Plc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of pending motions | 1 | 1 | 1 |  |  |  |  |  |  | 1 | 1 | 1 |  |  |  |  |  |
Swaps antitrust litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of swap execution facilities | item |  |  |  |  |  |  |  |  |  | 3 | 3 | 3 |  |  |  |  |  |
Spoofing litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of class action lawsuits | action | 3 | 3 | 3 |  |  |  |  |  |  | 3 | 3 | 3 |  |  |  |  |  |
Madoff |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of class action lawsuits | action | 2 | 2 | 2 |  |  |  |  |  |  | 2 | 2 | 2 |  |  |  |  |  |
Damages claimed | $ |  |  |  |  |  |  |  |  |  |  | $ 298.0 |  |  |  |  |  |  |
EUA trading litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages quantified |  |  |  |  | £ 45.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of claimants | company |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 |  |  |
Offshoring VAT assessments | HMRC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Claimed unpaid VAT after tax assessment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | £ 143.0 |  |
Payments For Value Added Tax Assessments |  |  |  | £ 143.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal proceedings money laundering regulation litigation | National Westminster Bank Plc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fines received | £ 264.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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