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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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period $ 693 $ 599 $ 661 $ 618
Provision for credit losses 33 10 63 (1)
Balance at end of period $ 728 $ 609 $ 728 $ 609
As a percentage of total loans 1.31% 1.18% 1.31% 1.18%
Financing Receivable        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period $ 641 $ 554 $ 610 $ 588
Loan charge-offs (11) (13) (23) (31)
Recoveries on loans previously charged-off 13 13 27 23
Net loan (charge-offs) recoveries 2 0 4 (8)
Provision for credit losses 41 9 70 (17)
Balance at end of period $ 684 $ 563 $ 684 $ 563
As a percentage of total loans 1.23% 1.09% 1.23% 1.09%
Unused Commitments to Extend Credit        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period $ 52 $ 45 $ 51 $ 30
Provision for credit losses (8) 1 (7) 16
Balance at end of period 44 46 44 46
Business loans:        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period 609 526 581 555
Provision for credit losses 36 11 62 (10)
Balance at end of period $ 648 $ 536 $ 648 $ 536
As a percentage of total loans 1.26% 1.13% 1.26% 1.13%
Business loans: | Financing Receivable        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period $ 570 $ 493 $ 541 $ 531
Loan charge-offs (10) (13) (21) (30)
Recoveries on loans previously charged-off 13 12 26 21
Net loan (charge-offs) recoveries 3 (1) 5 (9)
Provision for credit losses 41 10 68 (20)
Balance at end of period $ 614 $ 502 $ 614 $ 502
As a percentage of total loans 1.19% 1.06% 1.19% 1.06%
Business loans: | Unused Commitments to Extend Credit        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period $ 39 $ 33 $ 40 $ 24
Provision for credit losses (5) 1 (6) 10
Balance at end of period 34 34 34 34
Retail loans:        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period 84 73 80 63
Provision for credit losses (3) (1) 1 9
Balance at end of period $ 80 $ 73 $ 80 $ 73
As a percentage of total loans 1.95% 1.85% 1.95% 1.85%
Retail loans: | Financing Receivable        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period $ 71 $ 61 $ 69 $ 57
Loan charge-offs (1) 0 (2) (1)
Recoveries on loans previously charged-off 0 1 1 2
Net loan (charge-offs) recoveries (1) 1 (1) 1
Provision for credit losses 0 (1) 2 3
Balance at end of period $ 70 $ 61 $ 70 $ 61
As a percentage of total loans 1.70% 1.55% 1.70% 1.55%
Retail loans: | Unused Commitments to Extend Credit        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period $ 13 $ 12 $ 11 $ 6
Provision for credit losses (3) 0 (1) 6
Balance at end of period $ 10 $ 12 $ 10 $ 12