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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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]        
Balance at beginning of period $ 599 $ 807 $ 618 $ 992
Provision for credit losses 10 (135) (1) (317)
Balance at end of period $ 609 $ 683 $ 609 $ 683
As a percentage of total loans 1.18% 1.36% 1.18% 1.36%
Financing Receivable        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Balance at beginning of period $ 554 $ 777 $ 588 $ 948
Loan charge-offs (13) (8) (31) (24)
Recoveries on loans previously charged-off 13 19 23 32
Net loan (charge-offs) recoveries 0 11 (8) 8
Provision for credit losses 9 (136) (17) (304)
Balance at end of period $ 563 $ 652 $ 563 $ 652
As a percentage of total loans 1.09% 1.30% 1.09% 1.30%
Unused Commitments to Extend Credit        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Balance at beginning of period $ 45 $ 30 $ 30 $ 44
Provision for credit losses 1 1 16 (13)
Balance at end of period 46 31 46 31
Business loans        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Balance at beginning of period 526 731 555 930
Provision for credit losses 11 (130) (10) (326)
Balance at end of period $ 536 $ 613 $ 536 $ 613
As a percentage of total loans 1.13% 1.32% 1.13% 1.32%
Business loans | Financing Receivable        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Balance at beginning of period $ 493 $ 709 $ 531 $ 895
Loan charge-offs (13) (7) (30) (22)
Recoveries on loans previously charged-off 12 19 21 31
Net loan (charge-offs) recoveries (1) 12 (9) 9
Provision for credit losses 10 (132) (20) (315)
Balance at end of period $ 502 $ 589 $ 502 $ 589
As a percentage of total loans 1.06% 1.27% 1.06% 1.27%
Business loans | Unused Commitments to Extend Credit        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Balance at beginning of period $ 33 $ 22 $ 24 $ 35
Provision for credit losses 1 2 10 (11)
Balance at end of period 34 24 34 24
Retail loans        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Balance at beginning of period 73 76 63 62
Provision for credit losses (1) (5) 9 9
Balance at end of period $ 73 $ 70 $ 73 $ 70
As a percentage of total loans 1.85% 1.80% 1.85% 1.80%
Retail loans | Financing Receivable        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Balance at beginning of period $ 61 $ 68 $ 57 $ 53
Loan charge-offs 0 (1) (1) (2)
Recoveries on loans previously charged-off 1 0 2 1
Net loan (charge-offs) recoveries 1 (1) 1 (1)
Provision for credit losses (1) (4) 3 11
Balance at end of period $ 61 $ 63 $ 61 $ 63
As a percentage of total loans 1.55% 1.63% 1.55% 1.63%
Retail loans | Unused Commitments to Extend Credit        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Balance at beginning of period $ 12 $ 8 $ 6 $ 9
Provision for credit losses 0 (1) 6 (2)
Balance at end of period $ 12 $ 7 $ 12 $ 7