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Loans, Leases, and Allowance for Credit Losses (Summary of Selected Information on TDRs) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Financing Receivable, Modifications [Line Items]    
Amortized cost basis $ 97  
Percentage of total loans 0.20%  
Unfunded lending commitments on troubled debt restructuring $ 8 $ 7
Interest rate reduction    
Financing Receivable, Modifications [Line Items]    
Amortized cost basis 4  
Maturity or term extension    
Financing Receivable, Modifications [Line Items]    
Amortized cost basis 92  
Multiple modification types    
Financing Receivable, Modifications [Line Items]    
Amortized cost basis 1  
Commercial    
Financing Receivable, Modifications [Line Items]    
Amortized cost basis $ 46  
Percentage of total loans 0.20%  
Commercial | Interest rate reduction    
Financing Receivable, Modifications [Line Items]    
Amortized cost basis $ 4  
Commercial | Maturity or term extension    
Financing Receivable, Modifications [Line Items]    
Amortized cost basis 42  
Commercial | Multiple modification types    
Financing Receivable, Modifications [Line Items]    
Amortized cost basis 0  
Commercial | Commercial and industrial    
Financing Receivable, Modifications [Line Items]    
Amortized cost basis $ 36  
Percentage of total loans 0.20%  
Commercial | Commercial and industrial | Interest rate reduction    
Financing Receivable, Modifications [Line Items]    
Amortized cost basis $ 0  
Commercial | Commercial and industrial | Maturity or term extension    
Financing Receivable, Modifications [Line Items]    
Amortized cost basis 36  
Commercial | Commercial and industrial | Multiple modification types    
Financing Receivable, Modifications [Line Items]    
Amortized cost basis 0  
Commercial | Owner-occupied    
Financing Receivable, Modifications [Line Items]    
Amortized cost basis $ 10  
Percentage of total loans 0.10%  
Commercial | Owner-occupied | Interest rate reduction    
Financing Receivable, Modifications [Line Items]    
Amortized cost basis $ 4  
Commercial | Owner-occupied | Maturity or term extension    
Financing Receivable, Modifications [Line Items]    
Amortized cost basis 6  
Commercial | Owner-occupied | Multiple modification types    
Financing Receivable, Modifications [Line Items]    
Amortized cost basis 0  
Commercial real estate    
Financing Receivable, Modifications [Line Items]    
Amortized cost basis $ 49  
Percentage of total loans 0.40%  
Commercial real estate | Interest rate reduction    
Financing Receivable, Modifications [Line Items]    
Amortized cost basis $ 0  
Commercial real estate | Maturity or term extension    
Financing Receivable, Modifications [Line Items]    
Amortized cost basis 49  
Commercial real estate | Multiple modification types    
Financing Receivable, Modifications [Line Items]    
Amortized cost basis 0  
Commercial real estate | Term    
Financing Receivable, Modifications [Line Items]    
Amortized cost basis $ 49  
Percentage of total loans 0.50%  
Commercial real estate | Term | Interest rate reduction    
Financing Receivable, Modifications [Line Items]    
Amortized cost basis $ 0  
Commercial real estate | Term | Maturity or term extension    
Financing Receivable, Modifications [Line Items]    
Amortized cost basis 49  
Commercial real estate | Term | Multiple modification types    
Financing Receivable, Modifications [Line Items]    
Amortized cost basis 0  
Consumer    
Financing Receivable, Modifications [Line Items]    
Amortized cost basis $ 2  
Percentage of total loans 0.00%  
Consumer | Interest rate reduction    
Financing Receivable, Modifications [Line Items]    
Amortized cost basis $ 0  
Consumer | Maturity or term extension    
Financing Receivable, Modifications [Line Items]    
Amortized cost basis 1  
Consumer | Multiple modification types    
Financing Receivable, Modifications [Line Items]    
Amortized cost basis 1  
Consumer | 1-4 family residential    
Financing Receivable, Modifications [Line Items]    
Amortized cost basis $ 1  
Percentage of total loans 0.00%  
Consumer | 1-4 family residential | Interest rate reduction    
Financing Receivable, Modifications [Line Items]    
Amortized cost basis $ 0  
Consumer | 1-4 family residential | Maturity or term extension    
Financing Receivable, Modifications [Line Items]    
Amortized cost basis 0  
Consumer | 1-4 family residential | Multiple modification types    
Financing Receivable, Modifications [Line Items]    
Amortized cost basis 1  
Consumer | Bankcard and other revolving plans    
Financing Receivable, Modifications [Line Items]    
Amortized cost basis $ 1  
Percentage of total loans 0.20%  
Consumer | Bankcard and other revolving plans | Interest rate reduction    
Financing Receivable, Modifications [Line Items]    
Amortized cost basis $ 0  
Consumer | Bankcard and other revolving plans | Maturity or term extension    
Financing Receivable, Modifications [Line Items]    
Amortized cost basis 1  
Consumer | Bankcard and other revolving plans | Multiple modification types    
Financing Receivable, Modifications [Line Items]    
Amortized cost basis $ 0