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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 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2021
Jan. 01, 2020
Jan. 01, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]                            
Balance at beginning of period       $ 992       $ 668 $ 992 $ 668 $ 701      
Provision for loan losses $ (25) $ (42) $ (135) (182) $ (17) $ 5 $ 138 411 (384) 537 74      
Balance at end of period $ 618       $ 992       $ 618 $ 992 $ 668      
As a percentage of total loans 1.26%       1.90%       1.26% 1.90% 1.33%      
As a percentage of total loans excluding PPP Loans 1.27%       2.03%       1.27% 2.03%        
Accounting Standards Update 2016-13 [Member]                            
Financing Receivable, Allowance for Credit Loss [Line Items]                            
Reduction in business loans allowance for credit losses                       $ 0 $ (42) $ 0
Increase in retail loans allowance for credit losses                       0 25 0
Day-one decrease in the overall allowance for credit losses                       $ 0 $ (17) $ 0
Financing Receivable                            
Financing Receivable, Allowance for Credit Loss [Line Items]                            
Balance at beginning of period       948       637 $ 948 $ 637 $ 671      
Loan charge-offs                 (70) (238) (152)      
Recoveries on loans previously charged-off                 80 42 45      
Net loan (charge-offs) recoveries                 10 (196) (107)      
Provision for loan losses                 (370) 524 73      
Balance at end of period $ 588       $ 948       $ 588 $ 948 $ 637      
As a percentage of total loans 1.19%       1.81%       1.19% 1.81% 1.27%      
As a percentage of total loans excluding PPP Loans 1.20%       1.94%       1.20% 1.94%        
Unused Commitments to Extend Credit                            
Financing Receivable, Allowance for Credit Loss [Line Items]                            
Balance at beginning of period       44       31 $ 44 $ 31 $ 30      
Provision for loan losses                 (14) 13 1      
Balance at end of period $ 30       $ 44       30 44 31      
Business loans                            
Financing Receivable, Allowance for Credit Loss [Line Items]                            
Balance at beginning of period       930       629 930 629 653      
Provision for loan losses                 (384) 538 83      
Balance at end of period $ 555       $ 930       $ 555 $ 930 $ 629      
As a percentage of total loans 1.22%       1.93%       1.22% 1.93% 1.37%      
As a percentage of total loans excluding PPP Loans 1.24%       2.08%       1.24% 2.08%        
Business loans | Financing Receivable                            
Financing Receivable, Allowance for Credit Loss [Line Items]                            
Balance at beginning of period       895       601 $ 895 $ 601 $ 627      
Loan charge-offs                 (67) (233) (147)      
Recoveries on loans previously charged-off                 76 38 40      
Net loan (charge-offs) recoveries                 9 (195) (107)      
Provision for loan losses                 (373) 531 81      
Balance at end of period $ 531       $ 895       $ 531 $ 895 $ 601      
As a percentage of total loans 1.17%       1.85%       1.17% 1.85% 1.30%      
As a percentage of total loans excluding PPP Loans 1.18%       2.00%       1.18% 2.00%        
Business loans | Unused Commitments to Extend Credit                            
Financing Receivable, Allowance for Credit Loss [Line Items]                            
Balance at beginning of period       35       28 $ 35 $ 28 $ 26      
Provision for loan losses                 (11) 7 2      
Balance at end of period $ 24       $ 35       24 35 28      
Retail loans                            
Financing Receivable, Allowance for Credit Loss [Line Items]                            
Balance at beginning of period       62       39 62 39 48      
Provision for loan losses                 0 (1) (9)      
Balance at end of period $ 63       $ 62       $ 63 $ 62 $ 39      
As a percentage of total loans 1.63%       1.55%       1.63% 1.55% 0.91%      
Retail loans | Financing Receivable                            
Financing Receivable, Allowance for Credit Loss [Line Items]                            
Balance at beginning of period       53       36 $ 53 $ 36 $ 44      
Loan charge-offs                 (3) (5) (5)      
Recoveries on loans previously charged-off                 4 4 5      
Net loan (charge-offs) recoveries                 1 (1) 0      
Provision for loan losses                 3 (7) (8)      
Balance at end of period $ 57       $ 53       $ 57 $ 53 $ 36      
As a percentage of total loans 1.47%       1.32%       1.47% 1.32% 0.84%      
Retail loans | Unused Commitments to Extend Credit                            
Financing Receivable, Allowance for Credit Loss [Line Items]                            
Balance at beginning of period       $ 9       $ 3 $ 9 $ 3 $ 4      
Provision for loan losses                 (3) 6 (1)      
Balance at end of period $ 6       $ 9       $ 6 $ 9 $ 3