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Allowance for Credit Losses on Loans and Leases - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Jan. 01, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Valuation Allowance [Line Items]        
Allowance for credit losses on loans and leases   $ 199 $ 194 $ 148
Increase in allowance for credit losses on loans and leases $ 2 $ 15 3  
COVID-19 pandemic, impacts   For the year ended December 31, 2021 the allowance for credit losses on loans and leases remained relatively flat primarily due to the combination of macroeconomic factors and increased loan activity on the balance sheet. The key contributing forecasted macroeconomic and market level factors included relatively unchanged unemployment rates, slight increase in Gross Domestic Product (“GDP”) and improving Multi Family and Commercial Real Estate Property Prices reflecting the improving economic landscape as the COVID-19 pandemic begins to subside. In addition to these quantitative inputs, several qualitative factors were considered, including the risk that the economic decline proves to be more severe and/or prolonged than our baseline forecast which also increased our allowance for loan and lease losses.    
Provision for loan losses   $ 3 62 7
Unfunded Loan Commitment        
Valuation Allowance [Line Items]        
Allowance for credit losses   12 $ 12 $ 1
CARES Act        
Valuation Allowance [Line Items]        
Allowance for credit losses on loans and leases   199    
Increase in allowance for credit losses on loans and leases   5    
Provision for loan losses   3    
Recoveries from credit losses   $ 2