XML 57 R47.htm IDEA: XBRL DOCUMENT
v3.25.2

Credit Quality And Allowance For Credit Losses (Loans By Credit Quality Indicator and Vintage Year) (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024
Loans by Credit Quality Indicator and Vintage Year |  |  |  |
2025 |  | $ 3,496 |  | $ 5,793
2024 |  | 5,246 |  | 5,339
2023 |  | 4,946 |  | 8,236
2022 |  | 7,440 |  | 5,038
2021 |  | 4,416 |  | 2,296
Prior |  | 5,885 |  | 4,510
Revolvers |  | 19,650 |  | 19,222
Revolvers Converted to Term |  | 100 |  | 105
Total loans |  | 51,179 |  | 50,539
Business loans: | Commercial |  |  |  |
Loans by Credit Quality Indicator and Vintage Year |  |  |  |
2025 |  | 3,355 |  | 5,577
2024 |  | 5,030 |  | 5,092
2023 |  | 4,724 |  | 7,928
2022 |  | 7,159 |  | 4,680
2021 |  | 4,074 |  | 1,871
Prior |  | 5,002 |  | 4,006
Revolvers |  | 17,636 |  | 17,168
Revolvers Converted to Term |  | 17 |  | 17
Total loans |  | 46,997 |  | 46,339
Business loans: | Commercial | Domestic |  |  |  |
Loans by Credit Quality Indicator and Vintage Year |  |  |  |
2025 |  | 1,681 |  | 3,403
2024 |  | 2,886 |  | 2,289
2023 |  | 1,938 |  | 2,035
2022 |  | 1,691 |  | 1,312
2021 |  | 1,006 |  | 391
Prior |  | 1,413 |  | 1,251
Revolvers |  | 16,216 |  | 15,794
Revolvers Converted to Term |  | 17 |  | 17
Total loans |  | 26,848 |  | 26,492
Total gross charge-offs |  |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff |  | 0 |  | 1
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff |  | 11 |  | 1
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff |  | 3 |  | 9
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff |  | 12 |  | 29
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff |  | 6 |  | 9
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff |  | 7 |  | 12
Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff |  | 5 |  | 10
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff |  | 0 |  | 1
Total Charge offs |  | 44 |  | 72
Business loans: | Commercial | Domestic | Pass |  |  |  |
Loans by Credit Quality Indicator and Vintage Year |  |  |  |
2025 | [1] | 1,657 |  | 3,313
2024 | [1] | 2,785 |  | 2,129
2023 | [1] | 1,775 |  | 1,856
2022 | [1] | 1,492 |  | 1,127
2021 | [1] | 899 |  | 358
Prior | [1] | 1,356 |  | 1,192
Revolvers | [1] | 15,449 |  | 15,173
Revolvers Converted to Term | [1] | 13 |  | 15
Total loans | [1] | 25,426 |  | 25,163
Business loans: | Commercial | Domestic | Criticized |  |  |  |
Loans by Credit Quality Indicator and Vintage Year |  |  |  |
2025 | [2] | 24 |  | 90
2024 | [2] | 101 |  | 160
2023 | [2] | 163 |  | 179
2022 | [2] | 199 |  | 185
2021 | [2] | 107 |  | 33
Prior | [2] | 57 |  | 59
Revolvers | [2] | 767 |  | 621
Revolvers Converted to Term | [2] | 4 |  | 2
Total loans | [2] | 1,422 |  | 1,329
Business loans: | Commercial | International |  |  |  |
Loans by Credit Quality Indicator and Vintage Year |  |  |  |
2025 |  | 426 |  | 244
2024 |  | 93 |  | 112
2023 |  | 96 |  | 142
2022 |  | 97 |  | 60
2021 |  | 3 |  | 19
Prior |  | 38 |  | 27
Revolvers |  | 359 |  | 348
Revolvers Converted to Term |  | 0 |  | 0
Total loans |  | 1,112 |  | 952
Total gross charge-offs |  |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff |  |  |  | 1
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff |  |  |  | 0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff |  |  |  | 0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff |  |  |  | 0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff |  |  |  | 0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff |  |  |  | 0
Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff |  |  |  | 0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff |  |  |  | 0
Total Charge offs |  |  |  | 1
Business loans: | Commercial | International | Pass |  |  |  |
Loans by Credit Quality Indicator and Vintage Year |  |  |  |
2025 | [1] | 420 |  | 237
2024 | [1] | 88 |  | 112
2023 | [1] | 86 |  | 142
2022 | [1] | 97 |  | 60
2021 | [1] | 3 |  | 19
Prior | [1] | 38 |  | 27
Revolvers | [1] | 357 |  | 347
Revolvers Converted to Term | [1] | 0 |  | 0
Total loans | [1] | 1,089 |  | 944
Business loans: | Commercial | International | Criticized |  |  |  |
Loans by Credit Quality Indicator and Vintage Year |  |  |  |
2025 | [2] | 6 |  | 7
2024 | [2] | 5 |  | 0
2023 | [2] | 10 |  | 0
2022 | [2] | 0 |  | 0
2021 | [2] | 0 |  | 0
Prior | [2] | 0 |  | 0
Revolvers | [2] | 2 |  | 1
Revolvers Converted to Term | [2] | 0 |  | 0
Total loans | [2] | 23 |  | 8
Business loans: | Commercial | Real estate construction | Domestic |  |  |  |
Loans by Credit Quality Indicator and Vintage Year |  |  |  |
2025 |  | 126 |  | 137
2024 |  | 280 |  | 703
2023 |  | 736 |  | 2,023
2022 |  | 1,755 |  | 550
2021 |  | 450 |  | 19
Prior |  | 9 |  | 25
Revolvers |  | 202 |  | 223
Revolvers Converted to Term |  | 0 |  | 0
Total loans |  | 3,558 |  | 3,680
Total gross charge-offs |  |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff |  | 0 |  |
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff |  | 0 |  |
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff |  | 0 |  |
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff |  | 7 |  |
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff |  | 0 |  |
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff |  | 0 |  |
Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff |  | 0 |  |
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff |  | 0 |  |
Total Charge offs |  | 7 |  |
Business loans: | Commercial | Real estate construction | Domestic | Pass |  |  |  |
Loans by Credit Quality Indicator and Vintage Year |  |  |  |
2025 | [1] | 115 |  | 137
2024 | [1] | 280 |  | 703
2023 | [1] | 736 |  | 1,987
2022 | [1] | 1,680 |  | 550
2021 | [1] | 443 |  | 19
Prior | [1] | 9 |  | 23
Revolvers | [1] | 202 |  | 223
Revolvers Converted to Term | [1] | 0 |  | 0
Total loans | [1] | 3,465 |  | 3,642
Business loans: | Commercial | Real estate construction | Domestic | Criticized |  |  |  |
Loans by Credit Quality Indicator and Vintage Year |  |  |  |
2025 | [2] | 11 |  | 0
2024 | [2] | 0 |  | 0
2023 | [2] | 0 |  | 36
2022 | [2] | 75 |  | 0
2021 | [2] | 7 |  | 0
Prior | [2] | 0 |  | 2
Revolvers | [2] | 0 |  | 0
Revolvers Converted to Term | [2] | 0 |  | 0
Total loans | [2] | 93 |  | 38
Business loans: | Commercial | Commercial mortgage: | Domestic |  |  |  |
Loans by Credit Quality Indicator and Vintage Year |  |  |  |
2025 |  | 1,037 |  | 1,528
2024 |  | 1,521 |  | 1,761
2023 |  | 1,728 |  | 3,689
2022 |  | 3,584 |  | 2,678
2021 |  | 2,547 |  | 1,412
Prior |  | 3,449 |  | 2,622
Revolvers |  | 859 |  | 803
Revolvers Converted to Term |  | 0 |  | 0
Total loans |  | 14,725 |  | 14,493
Total gross charge-offs |  |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff |  | 0 |  | 0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff |  | 0 |  | 0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff |  | 0 |  | 11
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff |  | 9 |  | 0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff |  | 0 |  | 0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff |  | 0 |  | 5
Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff |  | 0 |  | 0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff |  | 0 |  | 0
Total Charge offs |  | 9 |  | 16
Business loans: | Commercial | Commercial mortgage: | Domestic | Pass |  |  |  |
Loans by Credit Quality Indicator and Vintage Year |  |  |  |
2025 | [1] | 1,028 |  | 1,423
2024 | [1] | 1,455 |  | 1,574
2023 | [1] | 1,509 |  | 3,339
2022 | [1] | 3,198 |  | 2,576
2021 | [1] | 2,406 |  | 1,301
Prior | [1] | 3,192 |  | 2,414
Revolvers | [1] | 855 |  | 793
Revolvers Converted to Term | [1] | 0 |  | 0
Total loans | [1] | 13,643 |  | 13,420
Business loans: | Commercial | Commercial mortgage: | Domestic | Criticized |  |  |  |
Loans by Credit Quality Indicator and Vintage Year |  |  |  |
2025 | [2] | 9 |  | 105
2024 | [2] | 66 |  | 187
2023 | [2] | 219 |  | 350
2022 | [2] | 386 |  | 102
2021 | [2] | 141 |  | 111
Prior | [2] | 257 |  | 208
Revolvers | [2] | 4 |  | 10
Revolvers Converted to Term | [2] | 0 |  | 0
Total loans | [2] | 1,082 |  | 1,073
Business loans: | Commercial | Lease financing | Domestic |  |  |  |
Loans by Credit Quality Indicator and Vintage Year |  |  |  |
2025 |  | 85 |  | 265
2024 |  | 250 |  | 227
2023 |  | 226 |  | 39
2022 |  | 32 |  | 80
2021 |  | 68 |  | 30
Prior |  | 93 |  | 81
Revolvers |  | 0 |  | 0
Revolvers Converted to Term |  | 0 |  | 0
Total loans |  | 754 |  | 722
Total gross charge-offs |  |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff |  | 1 |  | 1
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff |  | 0 |  | 0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff |  | 0 |  | 3
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff |  | 0 |  | 0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff |  | 0 |  | 0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff |  | 0 |  | 0
Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff |  | 0 |  | 0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff |  | 0 |  | 0
Total Charge offs |  | 1 |  | 4
Business loans: | Commercial | Lease financing | Domestic | Pass |  |  |  |
Loans by Credit Quality Indicator and Vintage Year |  |  |  |
2025 | [1] | 83 |  | 262
2024 | [1] | 248 |  | 226
2023 | [1] | 221 |  | 38
2022 | [1] | 26 |  | 80
2021 | [1] | 37 |  | 30
Prior | [1] | 92 |  | 80
Revolvers | [1] | 0 |  | 0
Revolvers Converted to Term | [1] | 0 |  | 0
Total loans | [1] | 707 |  | 716
Business loans: | Commercial | Lease financing | Domestic | Criticized |  |  |  |
Loans by Credit Quality Indicator and Vintage Year |  |  |  |
2025 | [2] | 2 |  | 3
2024 | [2] | 2 |  | 1
2023 | [2] | 5 |  | 1
2022 | [2] | 6 |  | 0
2021 | [2] | 31 |  | 0
Prior | [2] | 1 |  | 1
Revolvers | [2] | 0 |  | 0
Revolvers Converted to Term | [2] | 0 |  | 0
Total loans | [2] | 47 |  | 6
Retail loans: |  |  |  |
Loans by Credit Quality Indicator and Vintage Year |  |  |  |
2025 |  | 141 |  | 216
2024 |  | 216 |  | 247
2023 |  | 222 |  | 308
2022 |  | 281 |  | 358
2021 |  | 342 |  | 425
Prior |  | 883 |  | 504
Revolvers |  | 2,014 |  | 2,054
Revolvers Converted to Term |  | 83 |  | 88
Total loans |  | 4,182 |  | 4,200
Retail loans: | Residential mortgage |  |  |  |
Loans by Credit Quality Indicator and Vintage Year |  |  |  |
2025 |  | 106 |  | 186
2024 |  | 188 |  | 237
2023 |  | 215 |  | 278
2022 |  | 271 |  | 351
2021 |  | 339 |  | 419
Prior |  | 835 |  | 458
Revolvers |  | 0 |  | 0
Revolvers Converted to Term |  | 0 |  | 0
Total loans |  | 1,954 |  | 1,929
Retail loans: | Residential mortgage | Pass |  |  |  |
Loans by Credit Quality Indicator and Vintage Year |  |  |  |
2025 | [1] | 102 |  | 181
2024 | [1] | 186 |  | 236
2023 | [1] | 214 |  | 274
2022 | [1] | 267 |  | 349
2021 | [1] | 336 |  | 415
Prior | [1] | 807 |  | 434
Revolvers | [1] | 0 |  | 0
Revolvers Converted to Term | [1] | 0 |  | 0
Total loans | [1] | 1,912 |  | 1,889
Retail loans: | Residential mortgage | Criticized |  |  |  |
Loans by Credit Quality Indicator and Vintage Year |  |  |  |
2025 | [2] | 4 |  | 5
2024 | [2] | 2 |  | 1
2023 | [2] | 1 |  | 4
2022 | [2] | 4 |  | 2
2021 | [2] | 3 |  | 4
Prior | [2] | 28 |  | 24
Revolvers | [2] | 0 |  | 0
Revolvers Converted to Term | [2] | 0 |  | 0
Total loans | [2] | 42 |  | 40
Retail loans: | Consumer |  |  |  |
Loans by Credit Quality Indicator and Vintage Year |  |  |  |
2025 |  | 35 |  | 30
2024 |  | 28 |  | 10
2023 |  | 7 |  | 30
2022 |  | 10 |  | 7
2021 |  | 3 |  | 6
Prior |  | 48 |  | 46
Revolvers |  | 2,014 |  | 2,054
Revolvers Converted to Term |  | 83 |  | 88
Total loans |  | 2,228 |  | 2,271
Retail loans: | Consumer | Home equity |  |  |  |
Loans by Credit Quality Indicator and Vintage Year |  |  |  |
2025 |  | 0 |  | 0
2024 |  | 0 |  | 0
2023 |  | 0 |  | 0
2022 |  | 0 |  | 0
2021 |  | 0 |  | 0
Prior |  | 4 |  | 5
Revolvers |  | 1,694 |  | 1,709
Revolvers Converted to Term |  | 83 |  | 88
Total loans |  | 1,781 |  | 1,802
Retail loans: | Consumer | Home equity | Pass |  |  |  |
Loans by Credit Quality Indicator and Vintage Year |  |  |  |
2025 | [1] | 0 |  | 0
2024 | [1] | 0 |  | 0
2023 | [1] | 0 |  | 0
2022 | [1] | 0 |  | 0
2021 | [1] | 0 |  | 0
Prior | [1] | 4 |  | 5
Revolvers | [1] | 1,665 |  | 1,681
Revolvers Converted to Term | [1] | 78 |  | 82
Total loans | [1] | 1,747 |  | 1,768
Retail loans: | Consumer | Home equity | Criticized |  |  |  |
Loans by Credit Quality Indicator and Vintage Year |  |  |  |
2025 | [2] | 0 |  | 0
2024 | [2] | 0 |  | 0
2023 | [2] | 0 |  | 0
2022 | [2] | 0 |  | 0
2021 | [2] | 0 |  | 0
Prior | [2] | 0 |  | 0
Revolvers | [2] | 29 |  | 28
Revolvers Converted to Term | [2] | 5 |  | 6
Total loans | [2] | 34 |  | 34
Retail loans: | Consumer | Other consumer |  |  |  |
Loans by Credit Quality Indicator and Vintage Year |  |  |  |
2025 |  | 35 |  | 30
2024 |  | 28 |  | 10
2023 |  | 7 |  | 30
2022 |  | 10 |  | 7
2021 |  | 3 |  | 6
Prior |  | 44 |  | 41
Revolvers |  | 320 |  | 345
Revolvers Converted to Term |  | 0 |  | 0
Total loans |  | 447 |  | 469
Total gross charge-offs |  |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff |  | 0 |  | 1
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff |  | 0 |  | 0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff |  | 0 |  | 0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff |  | 0 |  | 0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff |  | 0 |  | 0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff |  | 2 |  | 1
Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff |  | 0 |  | 0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff |  | 0 |  | 0
Total Charge offs |  | 2 |  | 2
Retail loans: | Consumer | Other consumer | Pass |  |  |  |
Loans by Credit Quality Indicator and Vintage Year |  |  |  |
2025 | [1] | 35 |  | 30
2024 | [1] | 28 |  | 10
2023 | [1] | 7 |  | 28
2022 | [1] | 8 |  | 7
2021 | [1] | 3 |  | 6
Prior | [1] | 44 |  | 41
Revolvers | [1] | 320 |  | 345
Revolvers Converted to Term | [1] | 0 |  | 0
Total loans | [1] | 445 |  | 467
Retail loans: | Consumer | Other consumer | Criticized |  |  |  |
Loans by Credit Quality Indicator and Vintage Year |  |  |  |
2025 |  | 0 | [2] | 0
2024 |  | 0 | [2] | 0
2023 |  | 0 | [2] | 2
2022 |  | 2 | [2] | 0
2021 |  | 0 | [2] | 0
Prior |  | 0 | [2] | 0
Revolvers |  | 0 | [2] | 0
Revolvers Converted to Term |  | 0 | [2] | 0
Total loans |  | $ 2 | [2] | $ 2
[1] | Includes all loans not included in the categories of special mention, substandard or nonaccrual.
[2] | Includes loans with an internal rating of special mention, substandard loans for which the accrual of interest has not been discontinued and nonaccrual loans. Special mention loans have potential credit weaknesses that deserve management’s close attention, such as loans to borrowers who may be experiencing financial difficulties that may result in deterioration of repayment prospects from the borrower at some future date. Accruing substandard loans have a well-defined weakness, or weaknesses, such as loans to borrowers who may be experiencing losses from operations or inadequate liquidity of a degree and duration that jeopardizes the orderly repayment of the loan. Substandard loans are also distinguished by the distinct possibility of loss in the future if these weaknesses are not corrected. Nonaccrual loans are loans for which the accrual of interest has been discontinued. For further information regarding nonaccrual loans, refer to the Nonperforming Assets subheading in Note 1 - Basis of Presentation and Accounting Policies on page F-52 in the Corporation's 2024 Annual Report. These categories are generally consistent with the "special mention" and "substandard" categories as defined by regulatory authorities. A minority of nonaccrual loans are consistent with the "doubtful" category.

X
- References No definition available. + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossWriteoffByOriginationYearAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-5 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossByOriginationYearAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated more than five years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated more than five years before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable that can be withdrawn, repaid, and redrawn. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestRevolving
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of revolving financing receivable converted to term loan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoan
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of revolving financing receivable converted to term loan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6A + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoanWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable that can be withdrawn, repaid, and redrawn. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated four years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated four years before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated three years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated three years before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated in current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated in current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated two years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated two years before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest of financing receivable originated in fiscal year prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated in fiscal year before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfFinancingReceivableTypeOfBorrowerAxis=us-gaap_CommercialBorrowerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GeographicDistributionAxis=us-gaap_GeographicDistributionDomesticMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_PassMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_CriticizedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GeographicDistributionAxis=us-gaap_GeographicDistributionForeignMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConstructionLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_RealEstateLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=cma_LeaseFinancingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ResidentialMortgageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfFinancingReceivableTypeOfBorrowerAxis=us-gaap_ConsumerBorrowerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=cma_ConsumerFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |