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Loans and Related Allowance for Credit Losses (Analysis of Loan Portfolio) (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Financing Receivable, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss | [1] | $ 290,230 | $ 241,928
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 |  | $ 900 | $ 1,300
Collateral Dependent |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss |  | 1,700 | 1,500
Other assets |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Accrued interest on loan portfolio |  | 800 | 700
Current or Less Than 30 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | $ 285,609 | $ 237,716
Percentage of total loans, past due |  | 98.41% | 98.27%
30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | $ 659 | $ 620
Percentage of total loans, past due |  | 0.23% | 0.26%
60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | $ 245 | $ 234
Percentage of total loans, past due |  | 0.08% | 0.10%
90 Days Or More Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | $ 492 | $ 509
Percentage of total loans, past due |  | 0.17% | 0.21%
Total Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | $ 1,396 | $ 1,363
Percentage of total loans, past due |  | 0.48% | 0.56%
Nonperforming Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss |  | $ 2,528 | $ 2,286
Percentage of total loans, past due |  | 0.87% | 0.94%
Fair Value Option Nonaccrual Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual loans |  | $ 697 | $ 563
Percentage of total loans, nonaccrual, past due |  | 0.24% | 0.23%
Total commercial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss |  | $ 195,187 | $ 167,203
Total commercial | Current or Less Than 30 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 193,690 | 166,075
Total commercial | 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 170 | 143
Total commercial | 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 56 | 32
Total commercial | 90 Days Or More Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 67 | 30
Total commercial | Total Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 293 | 205
Total commercial | Nonperforming Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss |  | 1,204 | 923
Total consumer |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss |  | 95,043 | 74,725
Total consumer | Current or Less Than 30 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 91,919 | 71,641
Total consumer | 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 489 | 477
Total consumer | 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 189 | 202
Total consumer | 90 Days Or More Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 425 | 479
Total consumer | Total Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 1,103 | 1,158
Total consumer | Nonperforming Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss |  | 1,324 | 1,363
Total consumer | Fair Value Option Nonaccrual Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual loans |  | 697 | 563
Commercial and industrial | Total commercial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss |  | 152,735 | 132,073
Commercial and industrial | Total commercial | Current or Less Than 30 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 151,703 | 131,245
Commercial and industrial | Total commercial | 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 97 | 106
Commercial and industrial | Total commercial | 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 50 | 26
Commercial and industrial | Total commercial | 90 Days Or More Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 56 | 30
Commercial and industrial | Total commercial | Total Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 203 | 162
Commercial and industrial | Total commercial | Nonperforming Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss |  | 829 | 666
Commercial real estate | Total commercial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss |  | 36,195 | 28,716
Commercial real estate | Total commercial | Current or Less Than 30 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 35,749 | 28,485
Commercial real estate | Total commercial | 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 68 | 6
Commercial real estate | Total commercial | 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 2 | 1
Commercial real estate | Total commercial | 90 Days Or More Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 11 |
Commercial real estate | Total commercial | Total Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 81 | 7
Commercial real estate | Total commercial | Nonperforming Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss |  | 365 | 224
Equipment lease financing | Total commercial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss |  | 6,257 | 6,414
Equipment lease financing | Total commercial | Current or Less Than 30 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 6,238 | 6,345
Equipment lease financing | Total commercial | 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 5 | 31
Equipment lease financing | Total commercial | 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 4 | 5
Equipment lease financing | Total commercial | Total Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 9 | 36
Equipment lease financing | Total commercial | Nonperforming Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss |  | 10 | 33
Residential real estate |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss |  | 38,214 | 22,560
Residential real estate | Government insured or guaranteed loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss |  | 849 | 922
Residential real estate | Total consumer |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss |  | 38,214 | 24,088
Residential real estate | Total consumer | Current or Less Than 30 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 36,504 | 20,945
Residential real estate | Total consumer | 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 209 | 181
Residential real estate | Total consumer | 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 80 | 78
Residential real estate | Total consumer | 90 Days Or More Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 296 | 319
Residential real estate | Total consumer | Total Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 585 | 578
Residential real estate | Total consumer | Total Past Due | Government insured or guaranteed loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss |  | 400 | 400
Residential real estate | Total consumer | Nonperforming Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss |  | 533 | 528
Residential real estate | Total consumer | Fair Value Option Nonaccrual Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual loans |  | 592 | 509
Home equity |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss |  | 24,479 | 24,088
Home equity | Total consumer |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss |  | 24,479 | 22,560
Home equity | Total consumer | Current or Less Than 30 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 23,719 | 23,318
Home equity | Total consumer | 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 45 | 50
Home equity | Total consumer | 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 18 | 21
Home equity | Total consumer | Total Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 63 | 71
Home equity | Total consumer | Nonperforming Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss |  | 592 | 645
Home equity | Total consumer | Fair Value Option Nonaccrual Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual loans |  | 105 | 54
Automobile | Total consumer |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss |  | 17,265 | 14,218
Automobile | Total consumer | Current or Less Than 30 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 16,940 | 13,863
Automobile | Total consumer | 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 114 | 134
Automobile | Total consumer | 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 23 | 34
Automobile | Total consumer | 90 Days Or More Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 4 | 12
Automobile | Total consumer | Total Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 141 | 180
Automobile | Total consumer | Nonperforming Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss |  | 184 | 175
Credit card | Total consumer |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss |  | 6,466 | 6,215
Credit card | Total consumer | Current or Less Than 30 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 6,337 | 6,074
Credit card | Total consumer | 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 42 | 43
Credit card | Total consumer | 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 27 | 30
Credit card | Total consumer | 90 Days Or More Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 53 | 60
Credit card | Total consumer | Total Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 122 | 133
Credit card | Total consumer | Nonperforming Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss |  | 7 | 8
Education |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss |  | 2,653 | 2,946
Education | Total consumer |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss |  | 2,653 | 2,946
Education | Total consumer | Current or Less Than 30 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 2,521 | 2,785
Education | Total consumer | 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 45 | 55
Education | Total consumer | 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 26 | 29
Education | Total consumer | 90 Days Or More Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 61 | 77
Education | Total consumer | Total Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 132 | 161
Education | Total consumer | Total Past Due | Government insured or guaranteed loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss |  | 100 | 200
Other consumer |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss |  | 5,966 | 4,698
Other consumer | Total consumer |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss |  | 5,966 | 4,698
Other consumer | Total consumer | Current or Less Than 30 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 5,898 | 4,656
Other consumer | Total consumer | 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 34 | 14
Other consumer | Total consumer | 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 15 | 10
Other consumer | Total consumer | 90 Days Or More Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 11 | 11
Other consumer | Total consumer | Total Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, past due |  | 60 | 35
Other consumer | Total consumer | Nonperforming Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss |  | $ 8 | $ 7
[1] | Our consolidated assets included the following for which we have elected the fair value option: Loans held for sale of $2.0 billion, Loans held for investment of $1.6 billion and Other assets of $0.1 billion at September 30, 2021. Comparable amounts at December 31, 2020 were $1.2 billion, $1.4 billion and $0.1 billion, respectively.

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