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Litigation and Regulatory Matters - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2018
Sep. 30, 2018
Sep. 30, 2018
Loss Contingencies [Line Items]      
Expense related to various legal matters   $ 3,000,000 $ 513,000,000
Estimate of reasonably possible loss   $ 325,000,000 $ 325,000,000
Subsequent Event [Member] | Mortgage Securitization Activity Related Litigation [Member]      
Loss Contingencies [Line Items]      
Payments for Legal Settlements $ 492,000,000    
Subsequent Event [Member] | HSBC North America [Member] | Mortgage Securitization Activity Related Litigation [Member]      
Loss Contingencies [Line Items]      
Payments for Legal Settlements $ 765,000,000