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Allowance for Credit Losses on Loans and Leases - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Valuation Allowance [Line Items]            
Allowance for credit losses on loans and leases $ 202 $ 174 $ 202 $ 174 $ 194 $ 148
Increase in allowance for credit losses on loans and leases     $ 12      
COVID-19 pandemic, impacts     For the six months ended June 30, 2021, the allowance for credit losses on loan and leases increased primarily as a result of growth across segments of the loan portfolio, and by macroeconomic factors surrounding the COVID-19 pandemic, specifically the resultant estimated decreases in property values in the New York City area. The forecast includes a temporarily significant increase in Gross Domestic Product (“GDP”) to +6.9% in the second half of 2021 as the economy begins to recover from the systemic disruptions of the COVID-19 pandemic. Unemployment continues to subside from the historic shock of 2020, but is not forecasted to return to pre-pandemic levels around 3.5% until 2023. Interest rates are forecasted to begin to rise modestly and 10 Year-Baa spread widens slightly beginning in 2022 and levels off at 2.6% through 2023. In addition to these quantitative inputs, several qualitative factors were considered in increasing our allowance for loan and lease credit losses, including the risk that the economic decline proves to be more severe and/or prolonged than our baseline forecast.      
Net recoveries 4 $ (18) $ 0 $ (38)    
Unfunded Loan Commitment            
Valuation Allowance [Line Items]            
Allowance for credit losses 11   11      
CARES Act            
Valuation Allowance [Line Items]            
Allowance for credit losses on loans and leases $ 202   202      
Increase in allowance for credit losses on loans and leases     8      
Net recoveries     $ 7