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Loans and Related Allowance for Credit Losses (Analysis of Loan Portfolio) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans | [1] | $ 316,467 | $ 321,508
Percentage of total loans, past due |  | 100.00% | 100.00%
Accrued interest on loan portfolio |  | $ 1,300 | $ 1,500
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] |  | Other | Other
Unearned income, unamortized deferred fees and costs on originated loans, and premiums or discounts on purchased loans |  | $ 1,000 | $ 1,000
Collateral Pledged |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 1,600 | 1,400
Total Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | $ 1,382 | $ 1,384
Percentage of total loans, past due |  | 0.44% | 0.43%
Current or Less Than 30 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | $ 312,223 | $ 317,359
Percentage of total loans, past due |  | 98.66% | 98.71%
30-59 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | $ 697 | $ 685
Percentage of total loans, past due |  | 0.22% | 0.21%
60-89 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | $ 288 | $ 270
Percentage of total loans, past due |  | 0.09% | 0.08%
90 Days or More Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | $ 397 | $ 429
Percentage of total loans, past due |  | 0.13% | 0.13%
Nonperforming Loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | $ 2,326 | $ 2,180
Percentage of total loans, past due |  | 0.73% | 0.68%
Fair Value Option Nonaccrual Loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Nonaccrual loans |  | $ 536 | $ 585
Percentage of total loans, nonaccrual, past due |  | 0.17% | 0.18%
Residential real estate |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | $ 46,415 | $ 47,544
Residential real estate | Government insured or guaranteed loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 620 | 653
Home equity |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 25,991 | 26,150
Education |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 1,636 | 1,945
Other consumer |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 4,027 | 4,271
Commercial |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 216,164 | 219,558
Commercial | Total Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 370 | 290
Commercial | Current or Less Than 30 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 214,332 | 217,961
Commercial | 30-59 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 225 | 152
Commercial | 60-89 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 73 | 53
Commercial | 90 Days or More Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 72 | 85
Commercial | Nonperforming Loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 1,462 | 1,307
Commercial | Commercial and industrial |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 175,790 | 177,580
Commercial | Commercial and industrial | Total Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 274 | 225
Commercial | Commercial and industrial | Current or Less Than 30 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 174,988 | 176,796
Commercial | Commercial and industrial | 30-59 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 159 | 104
Commercial | Commercial and industrial | 60-89 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 43 | 45
Commercial | Commercial and industrial | 90 Days or More Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 72 | 76
Commercial | Commercial and industrial | Nonperforming Loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 528 | 559
Commercial | Commercial real estate |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 33,619 | 35,436
Commercial | Commercial real estate | Total Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 43 | 16
Commercial | Commercial real estate | Current or Less Than 30 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 32,657 | 34,685
Commercial | Commercial real estate | 30-59 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 25 | 7
Commercial | Commercial real estate | 60-89 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 18 |
Commercial | Commercial real estate | 90 Days or More Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  |  | 9
Commercial | Commercial real estate | Nonperforming Loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 919 | 735
Commercial | Equipment lease financing |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 6,755 | 6,542
Commercial | Equipment lease financing | Total Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 53 | 49
Commercial | Equipment lease financing | Current or Less Than 30 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 6,687 | 6,480
Commercial | Equipment lease financing | 30-59 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 41 | 41
Commercial | Equipment lease financing | 60-89 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 12 | 8
Commercial | Equipment lease financing | 90 Days or More Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  |  |
Commercial | Equipment lease financing | Nonperforming Loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 15 | 13
Consumer |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 100,303 | 101,950
Consumer | Total Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 1,012 | 1,094
Consumer | Current or Less Than 30 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 97,891 | 99,398
Consumer | 30-59 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 472 | 533
Consumer | 60-89 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 215 | 217
Consumer | 90 Days or More Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 325 | 344
Consumer | Nonperforming Loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 864 | 873
Consumer | Fair Value Option Nonaccrual Loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Nonaccrual loans |  | 536 | 585
Consumer | Residential real estate |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 46,415 | 47,544
Consumer | Residential real estate | Total Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 528 | 575
Consumer | Residential real estate | Total Past Due | Government insured or guaranteed loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 300 | 300
Consumer | Residential real estate | Current or Less Than 30 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 45,134 | 46,159
Consumer | Residential real estate | 30-59 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 234 | 282
Consumer | Residential real estate | 60-89 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 106 | 101
Consumer | Residential real estate | 90 Days or More Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 188 | 192
Consumer | Residential real estate | Nonperforming Loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 278 | 294
Consumer | Residential real estate | Fair Value Option Nonaccrual Loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Nonaccrual loans |  | 475 | 516
Consumer | Home equity |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 25,991 | 26,150
Consumer | Home equity | Total Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 97 | 90
Consumer | Home equity | Current or Less Than 30 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 25,351 | 25,533
Consumer | Home equity | 30-59 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 71 | 63
Consumer | Home equity | 60-89 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 26 | 27
Consumer | Home equity | 90 Days or More Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  |  |
Consumer | Home equity | Nonperforming Loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 482 | 458
Consumer | Home equity | Fair Value Option Nonaccrual Loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Nonaccrual loans |  | 61 | 69
Consumer | Automobile |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 15,355 | 14,860
Consumer | Automobile | Total Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 114 | 118
Consumer | Automobile | Current or Less Than 30 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 15,155 | 14,638
Consumer | Automobile | 30-59 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 83 | 91
Consumer | Automobile | 60-89 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 22 | 20
Consumer | Automobile | 90 Days or More Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 9 | 7
Consumer | Automobile | Nonperforming Loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 86 | 104
Consumer | Credit card |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 6,879 | 7,180
Consumer | Credit card | Total Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 168 | 179
Consumer | Credit card | Current or Less Than 30 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 6,696 | 6,991
Consumer | Credit card | 30-59 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 49 | 54
Consumer | Credit card | 60-89 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 38 | 39
Consumer | Credit card | 90 Days or More Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 81 | 86
Consumer | Credit card | Nonperforming Loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 15 | 10
Consumer | Education |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 1,636 | 1,945
Consumer | Education | Total Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 79 | 95
Consumer | Education | Total Past Due | Government insured or guaranteed loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 100 | 100
Consumer | Education | Current or Less Than 30 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 1,557 | 1,850
Consumer | Education | 30-59 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 25 | 27
Consumer | Education | 60-89 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 15 | 19
Consumer | Education | 90 Days or More Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 39 | 49
Consumer | Education | Nonperforming Loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  |  |
Consumer | Other consumer |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 4,027 | 4,271
Consumer | Other consumer | Total Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 26 | 37
Consumer | Other consumer | Current or Less Than 30 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 3,998 | 4,227
Consumer | Other consumer | 30-59 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 10 | 16
Consumer | Other consumer | 60-89 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 8 | 11
Consumer | Other consumer | 90 Days or More Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 8 | 10
Consumer | Other consumer | Nonperforming Loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | $ 3 | $ 7
[1] | Our consolidated assets included the following for which we have elected the fair value option: Loans held for sale of $0.8 billion, Loans of $1.2 billion and Other assets of $0.1 billion at December 31, 2024. Comparable amounts at December 31, 2023 were $0.7 billion, $1.2 billion and $0.1 billion, respectively.

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