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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