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Credit Quality And Allowance For Credit Losses (Changes In The Allowance For Loan Losses And Related Loan Amounts) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]        
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest $ 690 $ 688    
Financing receivable, allowance for credit loss, excluding accrued interest and off-balance-sheet 728 661 $ 618  
Provision for loan losses 49 89 60  
Financing receivable, allowance for credit loss, excluding accrued interest, end of period $ 725 $ 728 $ 661  
As a percentage of total loans 1.44% 1.40% 1.24%  
Financing Receivable [Member]        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest $ 690 $ 688 $ 610 $ 588
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff 95 62 68  
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery 43 40 51  
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff (Recovery) 52 22 17  
Provision for loan losses $ 54 $ 100 $ 39  
As a percentage of total loans 1.37% 1.32% 1.14%  
Unused Commitments to Extend Credit        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest $ 35 $ 40 $ 51 30
Provision for loan losses (5) (11) 21  
Business loans        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 653 651 581 555
Provision for loan losses $ 54 $ 91 $ 44  
As a percentage of total loans 1.41% 1.36% 1.18%  
Business loans | Financing Receivable [Member]        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest $ 625 $ 620 $ 541 531
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff 93 59 65  
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery 41 38 47  
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff (Recovery) 52 21 18  
Provision for loan losses $ 57 $ 100 $ 28  
As a percentage of total loans 1.35% 1.29% 1.10%  
Business loans | Unused Commitments to Extend Credit        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest $ 28 $ 31 $ 40 24
Provision for loan losses (3) (9) 16  
Retail loans        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 72 77 80 63
Provision for loan losses $ (5) $ (2) $ 16  
As a percentage of total loans 1.73% 1.85% 1.96%  
Retail loans | Financing Receivable [Member]        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest $ 65 $ 68 $ 69 57
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff 2 3 3  
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery 2 2 4  
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff (Recovery) 0 1 1  
Provision for loan losses $ (3) $ 0 $ 11  
As a percentage of total loans 1.55% 1.63% 1.67%  
Retail loans | Unused Commitments to Extend Credit        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest $ 7 $ 9 $ 11 $ 6
Provision for loan losses $ (2) $ (2) $ 5