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Loans, Leases, and Allowance for Credit Losses (Narrative) (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
mo
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]      
Net unamortized purchase premiums, discounts, and deferred loan fees and cost $ 149,000,000 $ 60,000,000  
Accrued interest receivable 200,000,000 164,000,000  
Loans 53,476,000,000 48,709,000,000  
Carrying values of loans that have been pledged as collateral 24,700,000,000 21,500,000,000  
Held-for-sale loans sold 1,800,000,000 872,000,000 $ 585,000,000
Payments for origination and purchases of loans held-for-sale 1,800,000,000 916,000,000 785,000,000
Principal balance of loans sold, serviced loans 2,800,000,000 1,700,000,000 2,200,000,000
Income from loans sold 54,000,000 18,000,000 $ 12,000,000
Financing receivable, commitments threshold for evaluating collectively or individually $ 1,000,000    
Financing receivable, minimum number of months for borrower to meet terms for TDR status | mo 6    
Unfunded Lending Commitments on Troubled Debt Restructuring $ 3,000,000 5,000,000  
Recorded investment in TDR loans modified with interest rates below market 311,000,000 153,000,000  
Real estate acquired through foreclosure 1,000,000 1,000,000  
Mortgage loans in process of foreclosure 10,000,000 8,000,000  
Doubtful      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans 4,000,000 0  
Commercial real estate      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans $ 12,104,000,000 11,555,000,000  
Financing receivable, period once past due, charged off or charged down 180 days    
Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans $ 10,900,000,000 11,766,000,000  
Financing receivable, period once past due, charged off or charged down 180 days    
Interest Rate Below Market, Including Multiple Modification Types      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded investment in TDR loans modified with interest rates below market $ 76,000,000 73,000,000  
Land Acquisition and Development | Commercial real estate      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans $ 156,000,000 $ 158,000,000  
Closed-End Consumer Loans | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Financing receivable, period once past due, charged off or charged down 120 days