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Litigation and Regulatory Matters - Additional Information (Details)
$ in Thousands
1 Months Ended 12 Months Ended 36 Months Ended
Dec. 31, 2019
USD ($)
Oct. 28, 2019
USD ($)
Sep. 30, 2019
CAD ($)
Feb. 28, 2019
USD ($)
trust
Mar. 31, 2018
USD ($)
Jan. 31, 2018
Oct. 31, 2017
former_employee
Mar. 31, 2017
USD ($)
Feb. 28, 2017
financial_institution
Aug. 31, 2016
former_employee
Nov. 30, 2015
plaintiff
count
Feb. 28, 2015
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2014
USD ($)
trust
Dec. 31, 2013
USD ($)
Dec. 31, 2012
plaintiff
county
Dec. 31, 2007
USD ($)
Loss Contingencies [Line Items]                                      
Expense related to various legal matters                         $ 54,000,000 $ 522,000,000 $ 29,000,000        
Estimate of reasonably possible loss $ 225,000,000                       225,000,000            
Dekalb County et. al. v. HSBC North America Holdings, Inc. et. al. [Member]                                      
Loss Contingencies [Line Items]                                      
Number of plaintiffs | plaintiff                                   3  
Number of counties in the area | county                                   5  
Litigation settlement 580,000                                    
County of Cook v. HSBC North America Holdings Inc., et. al. [Member]                                      
Loss Contingencies [Line Items]                                      
Litigation settlement 580,000                                    
Supranational, Sovereign and Agency Bonds [Member]                                      
Loss Contingencies [Line Items]                                      
Litigation settlement     $ 1,323                                
Deutsche Bank Alleged Breach of Representation [Member]                                      
Loss Contingencies [Line Items]                                      
Damages sought                                 $ 508,000,000    
Mortgage Securitization Pool Trust Litigation [Member]                                      
Loss Contingencies [Line Items]                                      
Damages sought                               $ 38,000,000,000      
Number of identified trusts | trust                               280      
Shareholder Derivative Action [Member]                                      
Loss Contingencies [Line Items]                                      
Deferred prosecution agreement, term                       5 years              
Jeffrey Siegel et. al. v. HSBC Holdings plc, et. al. [Member]                                      
Loss Contingencies [Line Items]                                      
Number of plaintiffs | plaintiff                     4                
Number of counts included in legal complaint | count                     1                
Rigoberto Vasquez and Eva Garcia et. al. v. Hong Kong and Shanghai Banking Corporation Ltd., HSBC Bank USA, N.A., et. al. [Member]                                      
Loss Contingencies [Line Items]                                      
Damages sought         $ 37,000,000                            
Telephone Consumer Protection Act Litigation [Member]                                      
Loss Contingencies [Line Items]                                      
Damages sought, per violation               $ 1,500                      
South African Competition Tribunal [Member]                                      
Loss Contingencies [Line Items]                                      
Number of financial institutions | financial_institution                 18                    
HSBC Bank USA [Member] | Commodity Futures Trading Commission Investigation [Member]                                      
Loss Contingencies [Line Items]                                      
Civil monetary penalty paid   $ 650,000                                  
Foreign Exchange Market Regulatory Investigation [Member] | HSBC Holdings plc [Member]                                      
Loss Contingencies [Line Items]                                      
Litigation settlement agreement, compliance period           3 years                          
Number of former employees indicted | former_employee                   2                  
Number of former employees found guilty | former_employee             1                        
HSBC Securities [Member] | Mortgage Securitization Activity Related Litigation [Member]                                      
Loss Contingencies [Line Items]                                      
Mortgage securitization loan purchased and sold                                     $ 24,000,000,000
Mortgage securitization outstanding loan purchase and sold $ 3,400,000,000                       $ 3,400,000,000 $ 3,800,000,000          
Park Royal LLC [Member] | Mortgage Securitization Pool Trust Litigation [Member]                                      
Loss Contingencies [Line Items]                                      
Damages sought       $ 59,000,000                              
Number of identified trusts | trust       3