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Memorandum items - Additional Information (Details)
£ in Millions, $ in Millions, $ in Millions
1 Months Ended 2 Months Ended 6 Months Ended 12 Months Ended 36 Months Ended 69 Months Ended
Nov. 30, 2022
entity
Jul. 31, 2022
action
May 31, 2022
GBP (£)
Dec. 31, 2021
action
item
Aug. 31, 2021
action
Dec. 31, 2020
GBP (£)
May 31, 2019
item
Jul. 31, 2017
Jan. 31, 2017
action
Dec. 31, 2015
Oct. 31, 2018
item
Dec. 31, 2019
item
Dec. 31, 2024
GBP (£)
action
item
case
Dec. 31, 2024
USD ($)
action
item
Dec. 31, 2023
GBP (£)
Dec. 31, 2022
GBP (£)
Dec. 31, 2018
GBP (£)
company
item
Dec. 31, 2011
USD ($)
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 | £                         £ 302   £ 264 £ 266      
provisions utilised | £                         428            
Litigation and other regulatory                                      
Litigation, investigations and reviews                                      
provisions utilised | £                         £ 35            
London Interbank Offered Rate (LIBOR) litigation                                      
Litigation, investigations and reviews                                      
Number of class action lawsuits | action                         1 1          
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       1                              
Number of securities frauds       1                              
Number of traders conducted trading and breached the NPA                                 2    
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                         20            
Number of remaining claimant banks                         19            
Other IBOR cases                                      
Litigation, investigations and reviews                                      
Number of class action lawsuits | action                 2                    
Number of class actions dismissed but appealed | case                         2            
Federal Court of Australia FX antitrust litigation                                      
Litigation, investigations and reviews                                      
Number of other parties subject to lawsuit or legal investigation             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   1 1          
Swaps antitrust litigation                                      
Litigation, investigations and reviews                                      
Number of swap execution facilities                         3 3          
Spoofing litigation                                      
Litigation, investigations and reviews                                      
Number of class action lawsuits | action   1   3                              
Madoff                                      
Litigation, investigations and reviews                                      
Number of class action lawsuits | action         1               2 2          
Damages claimed | $                           $ 298          
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    
Number of branches subject to tax assessment | company                                 2    
Payments for tax assessments | £     £ 153     £ 153                          
Value added tax receivables | £                         £ 153