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Allowance For Credit Losses (Analysis Of The Allowance For Credit Losses By Portfolio Segment) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Allowance for Loan and Lease Losses [Roll Forward]          
Allowance for loan losses, beginning of period $ 1,479 $ 2,167 $ 869    
Cumulative change in accounting guidance         $ 438
loans and leases receivable allowance beginning balances       $ 1,307  
Provision (credit) for loan losses 248 (493) 1,312    
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase   9 60    
Loan Losses:          
Charge-offs (375) (328) (613)    
Recoveries 112 124 101    
Net loan losses (263) (204) (512)    
Total allowance for loan losses 1,464 1,479 2,167    
Reserve For Unfunded Credit Commitments [Roll Forward]          
Reserve for unfunded credit commitments, beginning of year 95 126 45    
UnfundedcreditcommitmentsChangeinAccountingGuidance       63  
Reserve For Unfunded Credit Commitments Beginning Balance as adjusted for CECL     126   108
Provision (credit) for unfunded credit losses 23 (31) 18    
Reserve for unfunded credit commitments, end of year 118 95 126    
Allowance for Credit Losses, end of period 1,582 1,574 2,293    
Commercial Portfolio Segment [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Allowance for loan losses, beginning of period 682 1,196 537    
Cumulative change in accounting guidance         (3)
loans and leases receivable allowance beginning balances       534  
Provision (credit) for loan losses 40 (445) 927    
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase   0 60    
Loan Losses:          
Charge-offs (107) (128) (368)    
Recoveries 50 59 43    
Net loan losses (57) (69) (325)    
Total allowance for loan losses 665 682 1,196    
Reserve For Unfunded Credit Commitments [Roll Forward]          
Reserve for unfunded credit commitments, beginning of year 58 97 41    
UnfundedcreditcommitmentsChangeinAccountingGuidance       36  
Reserve For Unfunded Credit Commitments Beginning Balance as adjusted for CECL     97   77
Provision (credit) for unfunded credit losses 14 (39) 20    
Reserve for unfunded credit commitments, end of year 72 58 97    
Allowance for Credit Losses, end of period 737 740 1,293    
Total Investor Real Estate [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Allowance for loan losses, beginning of period 79 183 45    
Cumulative change in accounting guidance         7
loans and leases receivable allowance beginning balances       52  
Provision (credit) for loan losses 45 (87) 129    
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase   0 0    
Loan Losses:          
Charge-offs (5) (20) (1)    
Recoveries 2 3 3    
Net loan losses (3) (17) 2    
Total allowance for loan losses 121 79 183    
Reserve For Unfunded Credit Commitments [Roll Forward]          
Reserve for unfunded credit commitments, beginning of year 8 14 4    
UnfundedcreditcommitmentsChangeinAccountingGuidance       13  
Reserve For Unfunded Credit Commitments Beginning Balance as adjusted for CECL     14   17
Provision (credit) for unfunded credit losses 13 (6) (3)    
Reserve for unfunded credit commitments, end of year 21 8 14    
Allowance for Credit Losses, end of period 142 87 197    
Consumer Portfolio Segment [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Allowance for loan losses, beginning of period 718 788 287    
Cumulative change in accounting guidance         434
loans and leases receivable allowance beginning balances       721  
Provision (credit) for loan losses 163 39 256    
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase   9 0    
Loan Losses:          
Charge-offs (263) (180) (244)    
Recoveries 60 62 55    
Net loan losses (203) (118) (189)    
Total allowance for loan losses 678 718 788    
Reserve For Unfunded Credit Commitments [Roll Forward]          
Reserve for unfunded credit commitments, beginning of year 29 15 0    
UnfundedcreditcommitmentsChangeinAccountingGuidance       $ 14  
Reserve For Unfunded Credit Commitments Beginning Balance as adjusted for CECL     15   $ 14
Provision (credit) for unfunded credit losses (4) 14 1    
Reserve for unfunded credit commitments, end of year 25 29 15    
Allowance for Credit Losses, end of period $ 703 $ 747 $ 803