v3.19.3.a.u2
Summary of Significant Accounting Policies (Narrative) (Details)
 12 Months Ended
Dec. 31, 2019
USD ($)
Financing Receivable, Modifications [Line Items]  
New Revenue Recognition Standard, Amount of 2016 Non-Interest Income Within Scope When Adopted $ 1,700,000,000
Commercial And Investor Real Estate Loans Subject To Charge Offs Maximum $ 250,000
Days For Commercial and Investor Real Estate Loans To Be Evaluated As Potential Charge Off 180 days
Days For Consumer First Lien Postion Loans To Be Evaluated As Potential Charge Off 180 days
Days For Home Equity Loans In Second Lien Position To Be Evaluated As Potential Charge Off 120 days
Days For Consumer Close-Ended Loans To Be Evaluated As Potential Charge Off 120 days
Days for Consumer Loans in an Open-Ended Position to be Evaluated for Potential Charge Off 180 days
Days for Credit Cards to be Evaluated for Potential Charge Off 180 days
Quantitative Scope For Specific Evaluation For Impairment $ 2,500,000
Operating Lease, Right-of-Use Asset $ 443,000,000
Minimum [Member]  
Financing Receivable, Modifications [Line Items]  
Lessee, Operating Lease, Term of Contract 1 year
Operating Lease, Right-of-Use Asset $ 451,000,000
Maximum [Member]  
Financing Receivable, Modifications [Line Items]  
Lessee, Operating Lease, Term of Contract 20 years
Leasehold improvements | Minimum [Member]  
Financing Receivable, Modifications [Line Items]  
Property, Plant and Equipment, Useful Life 7 years
Leasehold improvements | Maximum [Member]  
Financing Receivable, Modifications [Line Items]  
Property, Plant and Equipment, Useful Life 40 years
Furniture and equipment | Minimum [Member]  
Financing Receivable, Modifications [Line Items]  
Property, Plant and Equipment, Useful Life 3 years
Furniture and equipment | Maximum [Member]  
Financing Receivable, Modifications [Line Items]  
Property, Plant and Equipment, Useful Life 10 years