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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
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at beginning of period $ 661 $ 618
Provision for credit losses 30 (11)
Balance at end of period $ 693 $ 599
As a percentage of total loans 1.26% 1.21%
Financing Receivable    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at beginning of period $ 610 $ 588
Loan charge-offs (12) (18)
Recoveries on loans previously charged-off 14 10
Net loan (charge-offs) recoveries 2 (8)
Provision for credit losses 29 (26)
Balance at end of period $ 641 $ 554
As a percentage of total loans 1.17% 1.12%
Unused Commitments to Extend Credit    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at beginning of period $ 51 $ 30
Provision for credit losses 1 15
Balance at end of period 52 45
Business loans:    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at beginning of period 581 555
Provision for credit losses 26 (21)
Balance at end of period $ 609 $ 526
As a percentage of total loans 1.20% 1.15%
Business loans: | Financing Receivable    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at beginning of period $ 541 $ 531
Loan charge-offs (11) (17)
Recoveries on loans previously charged-off 13 9
Net loan (charge-offs) recoveries 2 (8)
Provision for credit losses 27 (30)
Balance at end of period $ 570 $ 493
As a percentage of total loans 1.12% 1.08%
Business loans: | Unused Commitments to Extend Credit    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at beginning of period $ 40 $ 24
Provision for credit losses (1) 9
Balance at end of period 39 33
Retail loans:    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at beginning of period 80 63
Provision for credit losses 4 10
Balance at end of period $ 84 $ 73
As a percentage of total loans 2.04% 1.92%
Retail loans: | Financing Receivable    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at beginning of period $ 69 $ 57
Loan charge-offs (1) (1)
Recoveries on loans previously charged-off 1 1
Net loan (charge-offs) recoveries 0 0
Provision for credit losses 2 4
Balance at end of period $ 71 $ 61
As a percentage of total loans 1.71% 1.61%
Retail loans: | Unused Commitments to Extend Credit    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at beginning of period $ 11 $ 6
Provision for credit losses 2 6
Balance at end of period $ 13 $ 12