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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Jan. 01, 2022
Jan. 01, 2021
Jan. 01, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]            
Balance at beginning of period $ 618 $ 992 $ 668      
Provision for loan losses 60 (384) 537      
Balance at end of period $ 661 $ 618 $ 992      
Allowance as a percentage of total loans 1.24% 1.26% 1.90%      
Cumulative effect of change in accounting principle            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Reduction in business loans allowance for credit losses       $ 0 $ 0 $ (42)
Increase in retail loans allowance for credit losses       0 0 25
Day-one decrease in the overall allowance for credit losses       $ 0 $ 0 $ (17)
Financing Receivable            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Balance at beginning of period $ 588 $ 948 $ 637      
Loan charge-offs (68) (70) (238)      
Recoveries on loans previously charged-off 51 80 42      
Net loan (charge-offs) recoveries (17) 10 (196)      
Provision for loan losses 39 (370) 524      
Balance at end of period $ 610 $ 588 $ 948      
Allowance as a percentage of total loans 1.14% 1.19% 1.81%      
Unused Commitments to Extend Credit            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Balance at beginning of period $ 30 $ 44 $ 31      
Provision for loan losses 21 (14) 13      
Balance at end of period 51 30 44      
Business loans            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Balance at beginning of period 555 930 629      
Provision for loan losses 44 (384) 538      
Balance at end of period $ 581 $ 555 $ 930      
Allowance as a percentage of total loans 1.18% 1.22% 1.93%      
Business loans | Financing Receivable            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Balance at beginning of period $ 531 $ 895 $ 601      
Loan charge-offs (65) (67) (233)      
Recoveries on loans previously charged-off 47 76 38      
Net loan (charge-offs) recoveries (18) 9 (195)      
Provision for loan losses 28 (373) 531      
Balance at end of period $ 541 $ 531 $ 895      
Allowance as a percentage of total loans 1.10% 1.17% 1.85%      
Business loans | Unused Commitments to Extend Credit            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Balance at beginning of period $ 24 $ 35 $ 28      
Provision for loan losses 16 (11) 7      
Balance at end of period 40 24 35      
Retail loans            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Balance at beginning of period 63 62 39      
Provision for loan losses 16 0 (1)      
Balance at end of period $ 80 $ 63 $ 62      
Allowance as a percentage of total loans 1.96% 1.63% 1.55%      
Retail loans | Financing Receivable            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Balance at beginning of period $ 57 $ 53 $ 36      
Loan charge-offs (3) (3) (5)      
Recoveries on loans previously charged-off 4 4 4      
Net loan (charge-offs) recoveries 1 1 (1)      
Provision for loan losses 11 3 (7)      
Balance at end of period $ 69 $ 57 $ 53      
Allowance as a percentage of total loans 1.67% 1.47% 1.32%      
Retail loans | Unused Commitments to Extend Credit            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Balance at beginning of period $ 6 $ 9 $ 3      
Provision for loan losses 5 (3) 6      
Balance at end of period $ 11 $ 6 $ 9