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Litigation and Regulatory Matters - Narrative (Details)
$ in Millions, $ in Millions
1 Months Ended 12 Months Ended 36 Months Ended
Feb. 21, 2024
USD ($)
May 31, 2023
USD ($)
formerEmployee
May 31, 2022
USD ($)
Dec. 31, 2015
CAD ($)
Dec. 31, 2015
trust
Dec. 31, 2009
USD ($)
Dec. 31, 2007
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Nov. 30, 2019
person
Loss Contingencies [Line Items]                    
Estimate of reasonably possible loss               $ 100    
Interest Rate Swap Investigation                    
Loss Contingencies [Line Items]                    
Damages paid   $ 45                
Precious Metals Fix Matters, Canada Litigation                    
Loss Contingencies [Line Items]                    
Damages sought       $ 1,000            
Punitive damages sought       $ 250            
Madoff Litigation | HSBC USA                    
Loss Contingencies [Line Items]                    
Damages sought           $ 27        
Madoff Litigation | HSBC Bank USA                    
Loss Contingencies [Line Items]                    
Damages sought           $ 82        
Madoff Litigation | HSBC Bank USA | Pending Litigation                    
Loss Contingencies [Line Items]                    
Damages sought     $ 15              
Unapproved Electronic Messaging Platforms Investigation                    
Loss Contingencies [Line Items]                    
Damages paid   $ 30                
Mortgage Securitizationn Pool Trust Litigation                    
Loss Contingencies [Line Items]                    
Number of identified trusts | trust         280          
First Citizens Litigation                    
Loss Contingencies [Line Items]                    
Former employees | formerEmployee   7                
First Citizens Litigation | Subsequent Event                    
Loss Contingencies [Line Items]                    
Damages sought $ 1,000                  
Anti-Terrorism Act Case, Dana Bernhardt Et Al                    
Loss Contingencies [Line Items]                    
Former military personnel | person                   2
HSBC Securities                    
Loss Contingencies [Line Items]                    
Whole loan securitization             $ 24,000      
HSBC Securities | Mortgage Securitization Activity Related Litigation                    
Loss Contingencies [Line Items]                    
Mortgage securitization outstanding loan purchase and sold               $ 2,400 $ 2,500