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Allowance For Credit Losses (Analysis Of The Allowance For Credit Losses By Portfolio Segment) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Allowance for Loan and Lease Losses [Roll Forward]    
Allowance for loan losses, beginning of period $ 1,464 $ 1,479
Cumulative change in accounting guidance (38)  
LoanandLeaseReceivableAllowanceBeginningBalanceadjustedforchangeinaccountingguidance 1,426  
Provision (credit) for loan losses 129 (17)
Loan Losses:    
Charge-offs (105) (77)
Recoveries 22 31
Net loan losses (83) (46)
Total allowance for loan losses 1,472 1,416
Reserve For Unfunded Credit Commitments [Roll Forward]    
Reserve for unfunded credit commitments, beginning of year 118 95
Provision (credit) for unfunded credit losses 6 (19)
Reserve for unfunded credit commitments, end of year 124 76
Allowance for Credit Losses, end of period 1,596 1,492
Commercial Portfolio Segment [Member]    
Allowance for Loan and Lease Losses [Roll Forward]    
Allowance for loan losses, beginning of period 665 682
Cumulative change in accounting guidance (3)  
LoanandLeaseReceivableAllowanceBeginningBalanceadjustedforchangeinaccountingguidance 662  
Provision (credit) for loan losses 70 (49)
Loan Losses:    
Charge-offs (49) (26)
Recoveries 10 13
Net loan losses (39) (13)
Total allowance for loan losses 693 620
Reserve For Unfunded Credit Commitments [Roll Forward]    
Reserve for unfunded credit commitments, beginning of year 72 58
Provision (credit) for unfunded credit losses 5 (6)
Reserve for unfunded credit commitments, end of year 77 52
Allowance for Credit Losses, end of period 770 672
Total Investor Real Estate [Member]    
Allowance for Loan and Lease Losses [Roll Forward]    
Allowance for loan losses, beginning of period 121 79
Cumulative change in accounting guidance (3)  
LoanandLeaseReceivableAllowanceBeginningBalanceadjustedforchangeinaccountingguidance 118  
Provision (credit) for loan losses 8 (4)
Loan Losses:    
Charge-offs 0 0
Recoveries 0 0
Net loan losses 0 0
Total allowance for loan losses 126 75
Reserve For Unfunded Credit Commitments [Roll Forward]    
Reserve for unfunded credit commitments, beginning of year 21 8
Provision (credit) for unfunded credit losses 6 0
Reserve for unfunded credit commitments, end of year 27 8
Allowance for Credit Losses, end of period 153 83
Consumer Portfolio Segment [Member]    
Allowance for Loan and Lease Losses [Roll Forward]    
Allowance for loan losses, beginning of period 678 718
Cumulative change in accounting guidance (32)  
LoanandLeaseReceivableAllowanceBeginningBalanceadjustedforchangeinaccountingguidance 646  
Provision (credit) for loan losses 51 36
Loan Losses:    
Charge-offs (56) (51)
Recoveries 12 18
Net loan losses (44) (33)
Total allowance for loan losses 653 721
Reserve For Unfunded Credit Commitments [Roll Forward]    
Reserve for unfunded credit commitments, beginning of year 25 29
Provision (credit) for unfunded credit losses (5) (13)
Reserve for unfunded credit commitments, end of year 20 16
Allowance for Credit Losses, end of period $ 673 $ 737