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Loans and Related Allowance for Credit Losses (Analysis of Loan Portfolio) (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
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Financing Receivable, Past Due [Line Items] |  |  |
Total loans | [1] | $ 294,457 | $ 288,372
Percentage of total loans, past due |  | 100.00% | 100.00%
Unearned income, unamortized deferred fees and costs on originated loans, and premiums or discounts on purchased loans |  | $ 700 | $ 700
Collateral Dependent |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 1,400 | 1,700
Other assets |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Accrued interest on loan portfolio |  | 700 | 700
Financial Asset, Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | $ 1,699 | $ 1,985
Percentage of total loans, past due |  | 0.58% | 0.69%
Financial Asset, Not Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | $ 289,731 | $ 283,155
Percentage of total loans, past due |  | 98.39% | 98.19%
30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | $ 855 | $ 1,011
Percentage of total loans, past due |  | 0.29% | 0.35%
60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | $ 310 | $ 355
Percentage of total loans, past due |  | 0.11% | 0.12%
90 Days Or More Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | $ 534 | $ 619
Percentage of total loans, past due |  | 0.18% | 0.21%
Nonperforming Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | $ 2,298 | $ 2,480
Percentage of total loans, past due |  | 0.78% | 0.86%
Fair Value Option Nonaccrual Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual loans |  | $ 729 | $ 752
Percentage of total loans, nonaccrual, past due |  | 0.25% | 0.26%
Total commercial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | $ 198,261 | $ 193,078
Total commercial | Financial Asset, Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 491 | 537
Total commercial | Financial Asset, Not Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 196,772 | 191,373
Total commercial | 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 273 | 306
Total commercial | 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 106 | 98
Total commercial | 90 Days Or More Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 112 | 133
Total commercial | Nonperforming Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 998 | 1,168
Total consumer |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 96,196 | 95,294
Total consumer | Financial Asset, Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 1,208 | 1,448
Total consumer | Financial Asset, Not Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 92,959 | 91,782
Total consumer | 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 582 | 705
Total consumer | 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 204 | 257
Total consumer | 90 Days Or More Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 422 | 486
Total consumer | Nonperforming Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 1,300 | 1,312
Total consumer | Fair Value Option Nonaccrual Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual loans |  | 729 | 752
Commercial and industrial | Total commercial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 157,874 | 152,933
Commercial and industrial | Total commercial | Financial Asset, Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 354 | 439
Commercial and industrial | Total commercial | Financial Asset, Not Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 156,860 | 151,698
Commercial and industrial | Total commercial | 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 185 | 235
Commercial and industrial | Total commercial | 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 64 | 72
Commercial and industrial | Total commercial | 90 Days Or More Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 105 | 132
Commercial and industrial | Total commercial | Nonperforming Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 660 | 796
Commercial real estate | Total commercial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 34,171 | 34,015
Commercial real estate | Total commercial | Financial Asset, Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 116 | 71
Commercial real estate | Total commercial | Financial Asset, Not Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 33,723 | 33,580
Commercial real estate | Total commercial | 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 68 | 46
Commercial real estate | Total commercial | 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 41 | 24
Commercial real estate | Total commercial | 90 Days Or More Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 7 | 1
Commercial real estate | Total commercial | Nonperforming Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 332 | 364
Equipment lease financing | Total commercial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 6,216 | 6,130
Equipment lease financing | Total commercial | Financial Asset, Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 21 | 27
Equipment lease financing | Total commercial | Financial Asset, Not Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 6,189 | 6,095
Equipment lease financing | Total commercial | 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 20 | 25
Equipment lease financing | Total commercial | 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 1 | 2
Equipment lease financing | Total commercial | Nonperforming Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 6 | 8
Residential real estate |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 41,566 | 39,712
Residential real estate | Government insured or guaranteed loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 713 | 811
Residential real estate | Total consumer |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 41,566 | 39,712
Residential real estate | Total consumer | Financial Asset, Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 662 | 826
Residential real estate | Total consumer | Financial Asset, Past Due | Government insured or guaranteed loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 300 | 400
Residential real estate | Total consumer | Financial Asset, Not Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 39,738 | 37,706
Residential real estate | Total consumer | 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 305 | 379
Residential real estate | Total consumer | 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 84 | 119
Residential real estate | Total consumer | 90 Days Or More Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 273 | 328
Residential real estate | Total consumer | Nonperforming Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 526 | 517
Residential real estate | Total consumer | Fair Value Option Nonaccrual Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual loans |  | 640 | 663
Home equity |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 24,185 | 24,061
Home equity | Total consumer |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 24,185 | 24,061
Home equity | Total consumer | Financial Asset, Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 57 | 71
Home equity | Total consumer | Financial Asset, Not Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 23,463 | 23,305
Home equity | Total consumer | 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 41 | 53
Home equity | Total consumer | 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 16 | 18
Home equity | Total consumer | Nonperforming Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 576 | 596
Home equity | Total consumer | Fair Value Option Nonaccrual Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual loans |  | 89 | 89
Automobile | Total consumer |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 16,001 | 16,635
Automobile | Total consumer | Financial Asset, Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 143 | 200
Automobile | Total consumer | Financial Asset, Not Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 15,677 | 16,252
Automobile | Total consumer | 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 109 | 146
Automobile | Total consumer | 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 26 | 40
Automobile | Total consumer | 90 Days Or More Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 8 | 14
Automobile | Total consumer | Nonperforming Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 181 | 183
Credit card | Total consumer |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 6,464 | 6,626
Credit card | Total consumer | Financial Asset, Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 129 | 144
Credit card | Total consumer | Financial Asset, Not Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 6,327 | 6,475
Credit card | Total consumer | 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 39 | 49
Credit card | Total consumer | 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 28 | 33
Credit card | Total consumer | 90 Days Or More Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 62 | 62
Credit card | Total consumer | Nonperforming Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 8 | 7
Education |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 2,441 | 2,533
Education | Total consumer |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 2,441 | 2,533
Education | Total consumer | Financial Asset, Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 129 | 133
Education | Total consumer | Financial Asset, Past Due | Government insured or guaranteed loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 100 | 100
Education | Total consumer | Financial Asset, Not Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 2,312 | 2,400
Education | Total consumer | 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 41 | 43
Education | Total consumer | 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 24 | 25
Education | Total consumer | 90 Days Or More Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 64 | 65
Other consumer |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 5,539 | 5,727
Other consumer | Total consumer |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 5,539 | 5,727
Other consumer | Total consumer | Financial Asset, Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 88 | 74
Other consumer | Total consumer | Financial Asset, Not Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 5,442 | 5,644
Other consumer | Total consumer | 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 47 | 35
Other consumer | Total consumer | 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 26 | 22
Other consumer | Total consumer | 90 Days Or More Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 15 | 17
Other consumer | Total consumer | Nonperforming Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | $ 9 | $ 9
[1] | Our consolidated assets included the following for which we have elected the fair value option: Loans held for sale of $1.3 billion, Loans held for investment of $1.4 billion and Other assets of $0.1 billion at March 31, 2022. Comparable amounts at December 31, 2021 were $1.9 billion, $1.5 billion and $0.1 billion, respectively.

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