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Credit Quality And Allowance For Credit Losses (Aging Analysis Of Loans) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | $ 180 | $ 449
Nonaccrual loans |  | 264 | 347
Current loans | [1] | 48,841 | 51,495
Total loans |  | 49,285 | 52,291
30 to 59 days past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 118 | 243
60 to 89 days past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 35 | 161
90 days or more past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 27 | 45
Real estate construction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 2,948 | 4,082
Commercial mortgage |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 11,255 | 9,912
Business loans | Commercial borrower |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 132 | 410
Nonaccrual loans |  | 216 | 283
Current loans | [1] | 45,069 | 47,574
Total loans |  | 45,417 | 48,267
Business loans | Commercial borrower | 30 to 59 days past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 78 | 215
Business loans | Commercial borrower | 60 to 89 days past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 31 | 156
Business loans | Commercial borrower | 90 days or more past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 23 | 39
Business loans | Commercial borrower | Domestic loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 59 | 210
Nonaccrual loans |  | 173 | 252
Current loans | [1] | 29,134 | 32,291
Total loans |  | 29,366 | 32,753
Business loans | Commercial borrower | Domestic loans | 30 to 59 days past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 35 | 62
Business loans | Commercial borrower | Domestic loans | 60 to 89 days past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 18 | 115
Business loans | Commercial borrower | Domestic loans | 90 days or more past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 6 | 33
Business loans | Commercial borrower | International loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 14 | 0
Nonaccrual loans |  | 5 | 0
Current loans | [1] | 1,189 | 926
Total loans |  | 1,208 | 926
Business loans | Commercial borrower | International loans | 30 to 59 days past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 5 | 0
Business loans | Commercial borrower | International loans | 60 to 89 days past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 8 | 0
Business loans | Commercial borrower | International loans | 90 days or more past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 1 | 0
Business loans | Commercial borrower | Real estate construction | Domestic loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 16 | 40
Nonaccrual loans |  | 6 | 1
Current loans | [1] | 2,926 | 4,041
Total loans |  | 2,948 | 4,082
Business loans | Commercial borrower | Real estate construction | Domestic loans | 30 to 59 days past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 15 | 40
Business loans | Commercial borrower | Real estate construction | Domestic loans | 60 to 89 days past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 1 | 0
Business loans | Commercial borrower | Real estate construction | Domestic loans | 90 days or more past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 0 | 0
Business loans | Commercial borrower | Real estate construction | Domestic loans | Commercial Real Estate business line |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing | [2] | 0 | 31
Nonaccrual loans | [2] | 0 | 0
Current loans | [1],[2] | 2,391 | 3,626
Total loans | [2] | 2,391 | 3,657
Business loans | Commercial borrower | Real estate construction | Domestic loans | Commercial Real Estate business line | 30 to 59 days past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing | [2] | 0 | 31
Business loans | Commercial borrower | Real estate construction | Domestic loans | Commercial Real Estate business line | 60 to 89 days past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing | [2] | 0 | 0
Business loans | Commercial borrower | Real estate construction | Domestic loans | Commercial Real Estate business line | 90 days or more past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing | [2] | 0 | 0
Business loans | Commercial borrower | Real estate construction | Domestic loans | Other business lines |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing | [3] | 16 | 9
Nonaccrual loans | [3] | 6 | 1
Current loans | [1],[3] | 535 | 415
Total loans | [3] | 557 | 425
Business loans | Commercial borrower | Real estate construction | Domestic loans | Other business lines | 30 to 59 days past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing | [3] | 15 | 9
Business loans | Commercial borrower | Real estate construction | Domestic loans | Other business lines | 60 to 89 days past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing | [3] | 1 | 0
Business loans | Commercial borrower | Real estate construction | Domestic loans | Other business lines | 90 days or more past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing | [3] | 0 | 0
Business loans | Commercial borrower | Commercial mortgage | Domestic loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 38 | 145
Nonaccrual loans |  | 32 | 29
Current loans | [1] | 11,185 | 9,738
Total loans |  | 11,255 | 9,912
Business loans | Commercial borrower | Commercial mortgage | Domestic loans | 30 to 59 days past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 18 | 99
Business loans | Commercial borrower | Commercial mortgage | Domestic loans | 60 to 89 days past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 4 | 41
Business loans | Commercial borrower | Commercial mortgage | Domestic loans | 90 days or more past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 16 | 5
Business loans | Commercial borrower | Commercial mortgage | Domestic loans | Commercial Real Estate business line |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing | [2] | 0 | 52
Nonaccrual loans | [2] | 1 | 3
Current loans | [1],[2] | 3,337 | 2,218
Total loans | [2] | 3,338 | 2,273
Business loans | Commercial borrower | Commercial mortgage | Domestic loans | Commercial Real Estate business line | 30 to 59 days past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing | [2] | 0 | 51
Business loans | Commercial borrower | Commercial mortgage | Domestic loans | Commercial Real Estate business line | 60 to 89 days past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing | [2] | 0 | 1
Business loans | Commercial borrower | Commercial mortgage | Domestic loans | Commercial Real Estate business line | 90 days or more past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing | [2] | 0 | 0
Business loans | Commercial borrower | Commercial mortgage | Domestic loans | Other business lines |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing | [3] | 38 | 93
Nonaccrual loans | [3] | 31 | 26
Current loans | [1],[3] | 7,848 | 7,520
Total loans | [3] | 7,917 | 7,639
Business loans | Commercial borrower | Commercial mortgage | Domestic loans | Other business lines | 30 to 59 days past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing | [3] | 18 | 48
Business loans | Commercial borrower | Commercial mortgage | Domestic loans | Other business lines | 60 to 89 days past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing | [3] | 4 | 40
Business loans | Commercial borrower | Commercial mortgage | Domestic loans | Other business lines | 90 days or more past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing | [3] | 16 | 5
Business loans | Commercial borrower | Lease financing | Domestic loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 5 | 15
Nonaccrual loans |  | 0 | 1
Current loans | [1] | 635 | 578
Total loans |  | 640 | 594
Business loans | Commercial borrower | Lease financing | Domestic loans | 30 to 59 days past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 5 | 14
Business loans | Commercial borrower | Lease financing | Domestic loans | 60 to 89 days past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 0 | 0
Business loans | Commercial borrower | Lease financing | Domestic loans | 90 days or more past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 0 | 1
Retail loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 48 | 39
Nonaccrual loans |  | 48 | 64
Current loans | [1] | 3,772 | 3,921
Total loans |  | 3,868 | 4,024
Retail loans | 30 to 59 days past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 40 | 28
Retail loans | 60 to 89 days past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 4 | 5
Retail loans | 90 days or more past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 4 | 6
Retail loans | Residential mortgage |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 4 | 15
Nonaccrual loans |  | 36 | 47
Current loans | [1] | 1,731 | 1,768
Total loans |  | 1,771 | 1,830
Retail loans | Residential mortgage | 30 to 59 days past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 4 | 11
Retail loans | Residential mortgage | 60 to 89 days past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 0 | 4
Retail loans | Residential mortgage | 90 days or more past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 0 | 0
Retail loans | Home equity |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 44 | 24
Nonaccrual loans |  | 12 | 17
Current loans | [1] | 2,041 | 2,153
Total loans |  | 2,097 | 2,194
Retail loans | Home equity | 30 to 59 days past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 36 | 17
Retail loans | Home equity | 60 to 89 days past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 4 | 1
Retail loans | Home equity | 90 days or more past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 4 | 6
Retail loans | Home equity | Home equity |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 7 | 8
Nonaccrual loans |  | 12 | 17
Current loans | [1] | 1,514 | 1,563
Total loans |  | 1,533 | 1,588
Retail loans | Home equity | Home equity | 30 to 59 days past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 4 | 7
Retail loans | Home equity | Home equity | 60 to 89 days past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 3 | 1
Retail loans | Home equity | Home equity | 90 days or more past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 0 | 0
Retail loans | Home equity | Other consumer |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 37 | 16
Nonaccrual loans |  | 0 | 0
Current loans | [1] | 527 | 590
Total loans |  | 564 | 606
Retail loans | Home equity | Other consumer | 30 to 59 days past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 32 | 10
Retail loans | Home equity | Other consumer | 60 to 89 days past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | 1 | 0
Retail loans | Home equity | Other consumer | 90 days or more past due and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans past due and still accruing |  | $ 4 | $ 6
[1] | Includes $22 million and $141 million of loans with deferred payments not considered past due in accordance with the CARES Act, at December 31, 2021 and 2020, respectively.
[2] | Primarily loans to real estate developers.
[3] | Primarily loans secured by owner-occupied real estate.

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