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Litigation and regulatory matters - Other (Details) € in Millions | 1 Months Ended | 2 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2020 GBP (£) | May 31, 2019 USD ($) item | Jul. 31, 2017 item | Oct. 31, 2018 item | Jun. 30, 2022 GBP (£) item | Jun. 30, 2022 USD ($) item | Jun. 30, 2022 EUR (€) item | Dec. 31, 2019 GBP (£) | Dec. 31, 2021 USD ($) item | Dec. 31, 2020 USD ($) | Dec. 31, 2015 USD ($) item | Jun. 30, 2022 EUR (€) item | Dec. 31, 2018 USD ($) | Dec. 31, 2016 action
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of class action lawsuits |  |  |  |  |  |  |  |  | 3 |  |  |  |  |
Additional Provisions | £ |  |  |  |  | £ 137,000,000 |  |  |  |  |  |  |  |  |
Provisions utilised | £ |  |  |  |  | 226,000,000 |  |  |  |  |  |  |  |  |
Legal proceedings provision [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional Provisions | £ |  |  |  |  | 6,000,000 |  |  |  |  |  |  |  |  |
Provisions utilised | £ |  |  |  |  | 71,000,000 |  |  |  |  |  |  |  |  |
Treatment of tracker mortgage customers |  |  |  |  |  |  |  |  |  |  |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total aggregate provisions |  |  |  |  | 308,000,000 |  |  |  |  |  |  | € 358 |  |
Provisions utilised |  |  |  |  | 292,000,000 |  | € 339 |  |  |  |  |  |  |
Internal review from treatment of tracker mortgage customers |  |  |  |  |  |  |  |  |  |  |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total aggregate provisions |  |  |  |  | 173,000,000 |  |  |  |  |  |  | € 201 |  |
Provisions utilised |  |  |  |  | £ 136,000,000 |  | € 158 |  |  |  |  |  |  |
US investigations relating to fixed-income securities |  |  |  |  |  |  |  |  |  |  |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of years probation |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Penalty paid for criminal fines | $ |  |  |  |  |  |  |  |  | $ 25,200,000 |  |  |  |  |
Penalty paid for criminal forfeiture | $ |  |  |  |  |  |  |  |  | 2,800,000 |  |  |  |  |
Penalty paid for restitution | $ |  |  |  |  |  |  |  |  | $ 6,800,000 |  |  |  |  |
FDIC | Litigation and regulatory matters |  |  |  |  |  |  |  |  |  |  |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of failed US banks |  |  | 39 |  |  |  |  |  |  |  |  |  |  |
Number of banks for which claims have been dropped |  |  |  |  | 20 |  |  |  |  |  |  | 20 |  |
Number of remaining claimant banks |  |  |  |  | 19 |  |  |  |  |  |  | 19 |  |
London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of non-class action | action |  |  |  |  |  |  |  |  |  |  |  |  |  | 24
JPY LIBOR and Euroyen TIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of class action lawsuits |  |  |  |  | 2 | 2 | 2 |  |  |  |  |  |  |
Other LIBOR cases |  |  |  |  |  |  |  |  |  |  |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of class action lawsuits |  |  |  |  | 5 | 5 | 5 |  |  |  |  |  |  |
FX antitrust litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement amount paid | $ |  |  |  |  |  |  |  |  |  |  | $ 255,000,000 |  |  |
Federal Court of Australia FX antitrust litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other parties subject to lawsuit or legal investigation |  | 4 |  |  |  |  |  |  |  |  |  |  |  |
Federal Court of Australia FX antitrust litigation | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disputed transaction value | $ |  | $ 500,000 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |
Number of pending motions |  |  |  | 1 |  |  |  |  |  |  |  |  |  |
Swaps antitrust litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of swap execution facilities | $ |  |  |  |  |  | 3 |  |  |  |  |  |  |  |
Madoff |  |  |  |  |  |  |  |  |  |  |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of class action lawsuits |  |  |  |  | 2 | 2 | 2 |  |  |  |  |  |  |
Damages claimed | $ |  |  |  |  |  | $ 298,000,000 |  |  |  |  |  |  |  |
EUA trading litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages quantified | £ | £ 45,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of claimants |  |  |  |  |  |  |  |  |  |  | 10 |  |  |
Offshoring VAT assessments | HMRC |  |  |  |  |  |  |  |  |  |  |  |  |  |
UK 2008 rights issue shareholder litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Claimed unpaid VAT after tax assessment | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 143,000,000 |
Payments For Value Added Tax Assessments | $ |  |  |  |  |  |  |  |  |  | $ 143,000,000 |  |  |  |

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