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Litigation and Regulatory Matters - Additional Information (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 31, 2016
former_employee
Jun. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2014
trust
Loss Contingencies [Line Items]        
Expense related to various legal matters   $ 16,000,000 $ 510,000,000  
Estimate of reasonably possible loss   325,000,000 325,000,000  
Compensatory damages sought     $ 37,000,000  
Mortgage Securitization Activity Related Litigation [Member]        
Loss Contingencies [Line Items]        
Litigation Settlement, Amount Awarded to Other Party   492,000,000    
Mortgage Securitization Pool Trust Litigation [Member]        
Loss Contingencies [Line Items]        
Number of identified trusts | trust       280
HSBC Holdings plc [Member] | Foreign Exchange Market Regulatory Investigation [Member]        
Loss Contingencies [Line Items]        
Number of former employees indicted | former_employee 2      
Number of former employees found guilty | former_employee 1      
HSBC North America [Member] | Mortgage Securitization Activity Related Litigation [Member]        
Loss Contingencies [Line Items]        
Litigation Settlement, Amount Awarded to Other Party   765,000,000    
HSBC North America [Member] | Massachusetts State Attorney General Civil Investigation into RMBS Origination and Securitization Activities [Member]        
Loss Contingencies [Line Items]        
Litigation Settlement, Amount Awarded to Other Party   $ 26,800,000