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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 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period $ 717 $ 728 $ 728 $ 661 $ 661
Provision for credit losses 14 14 28 77  
Balance at end of period $ 720 $ 736 $ 720 $ 736 728
As a percentage of total loans 1.43% 1.38% 1.43% 1.38%  
Financing Receivable          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period $ 686 $ 684 $ 688 $ 610 610
Loan charge-offs (23) (14) (72) (37)  
Recoveries on loans previously charged-off 12 8 36 35  
Net loan (charge-offs) recoveries (11) (6) (36) (2)  
Provision for credit losses 11 16 34 86  
Balance at end of period $ 686 $ 694 $ 686 $ 694 688
As a percentage of total loans 1.36% 1.30% 1.36% 1.30%  
Unused Commitments to Extend Credit          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period $ 31 $ 44 $ 40 $ 51 51
Provision for credit losses 3 (2) (6) (9)  
Balance at end of period 34 42 34 42 40
Business loans:          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period 643 648 651 581 581
Provision for credit losses 12 17 30 79  
Balance at end of period $ 644 $ 659 $ 644 $ 659 651
As a percentage of total loans 1.39% 1.34% 1.39% 1.34%  
Business loans: | Financing Receivable          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period $ 620 $ 614 $ 620 $ 541 541
Loan charge-offs (23) (13) (71) (34)  
Recoveries on loans previously charged-off 12 7 34 33  
Net loan (charge-offs) recoveries (11) (6) (37) (1)  
Provision for credit losses 9 18 35 86  
Balance at end of period $ 618 $ 626 $ 618 $ 626 620
As a percentage of total loans 1.33% 1.27% 1.33% 1.27%  
Business loans: | Unused Commitments to Extend Credit          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period $ 23 $ 34 $ 31 $ 40 40
Provision for credit losses 3 (1) (5) (7)  
Balance at end of period 26 33 26 33 31
Retail loans:          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period 74 80 77 80 80
Provision for credit losses 2 (3) (2) (2)  
Balance at end of period $ 76 $ 77 $ 76 $ 77 77
As a percentage of total loans 1.83% 1.84% 1.83% 1.84%  
Retail loans: | Financing Receivable          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period $ 66 $ 70 $ 68 $ 69 69
Loan charge-offs 0 (1) (1) (3)  
Recoveries on loans previously charged-off 0 1 2 2  
Net loan (charge-offs) recoveries 0 0 1 (1)  
Provision for credit losses 2 (2) (1) 0  
Balance at end of period $ 68 $ 68 $ 68 $ 68 68
As a percentage of total loans 1.63% 1.62% 1.63% 1.62%  
Retail loans: | Unused Commitments to Extend Credit          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period $ 8 $ 10 $ 9 $ 11 11
Provision for credit losses 0 (1) (1) (2)  
Balance at end of period $ 8 $ 9 $ 8 $ 9 $ 9