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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