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Loans and Related Allowance for Credit Losses (Analysis of Loan Portfolio) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | $ 237,013 | $ 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 | $ 1,400 | $ 1,300
Collateral Dependent |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 1,400 | 1,500
Other Assets |  |
Financing Receivable, Past Due [Line Items] |  |
Accrued interest on loan portfolio | 700 | 700
Current or Less Than 30 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | $ 233,156 | $ 237,716
Percentage of total loans, past due | 98.38% | 98.27%
30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | $ 485 | $ 620
Percentage of total loans, past due | 0.20% | 0.26%
60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | $ 182 | $ 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 | $ 479 | $ 509
Percentage of total loans, past due | 0.20% | 0.21%
Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | $ 1,146 | $ 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 | $ 2,138 | $ 2,286
Percentage of total loans, past due | 0.90% | 0.94%
Fair Value Option Nonaccrual Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans | $ 573 | $ 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 | $ 164,506 | $ 167,203
Total commercial | Current or Less Than 30 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 163,566 | 166,075
Total commercial | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 113 | 143
Total commercial | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 15 | 32
Total commercial | 90 Days Or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 63 | 30
Total commercial | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 191 | 205
Total commercial | Nonperforming Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 749 | 923
Total consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 72,507 | 74,725
Total consumer | Current or Less Than 30 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 69,590 | 71,641
Total consumer | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 372 | 477
Total consumer | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 167 | 202
Total consumer | 90 Days Or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 416 | 479
Total consumer | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 955 | 1,158
Total consumer | Nonperforming Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 1,389 | 1,363
Total consumer | Fair Value Option Nonaccrual Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans | 573 | 563
Commercial and industrial | Total commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 129,798 | 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 | 129,130 | 131,245
Commercial and industrial | Total commercial | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 80 | 106
Commercial and industrial | Total commercial | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 13 | 26
Commercial and industrial | Total commercial | 90 Days Or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 63 | 30
Commercial and industrial | Total commercial | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 156 | 162
Commercial and industrial | Total commercial | Nonperforming Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 512 | 666
Commercial real estate | Total commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 28,319 | 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 | 28,085 | 28,485
Commercial real estate | Total commercial | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 12 | 6
Commercial real estate | Total commercial | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 1 | 1
Commercial real estate | Total commercial | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 13 | 7
Commercial real estate | Total commercial | Nonperforming Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 221 | 224
Equipment lease financing | Total commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 6,389 | 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 | 6,351 | 6,345
Equipment lease financing | Total commercial | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 21 | 31
Equipment lease financing | Total commercial | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 1 | 5
Equipment lease financing | Total commercial | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 22 | 36
Equipment lease financing | Total commercial | Nonperforming Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 16 | 33
Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 23,493 | 24,088
Home equity | Total consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 23,493 | 24,088
Home equity | Total consumer | Current or Less Than 30 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 22,706 | 23,318
Home equity | Total consumer | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 43 | 50
Home equity | Total consumer | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 20 | 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 | 656 | 645
Home equity | Total consumer | Fair Value Option Nonaccrual Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans | 68 | 54
Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 22,418 | 22,560
Residential real estate | Government insured or guaranteed loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 930 | 922
Residential real estate | Total consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 22,418 | 22,560
Residential real estate | Total consumer | Current or Less Than 30 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 20,862 | 20,945
Residential real estate | Total consumer | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 162 | 181
Residential real estate | Total consumer | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 73 | 78
Residential real estate | Total consumer | 90 Days Or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 275 | 319
Residential real estate | Total consumer | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 510 | 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 | 541 | 528
Residential real estate | Total consumer | Fair Value Option Nonaccrual Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans | 505 | 509
Automobile | Total consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 13,584 | 14,218
Automobile | Total consumer | Current or Less Than 30 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 13,305 | 13,863
Automobile | Total consumer | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 76 | 134
Automobile | Total consumer | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 19 | 34
Automobile | Total consumer | 90 Days Or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 6 | 12
Automobile | Total consumer | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 101 | 180
Automobile | Total consumer | Nonperforming Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 178 | 175
Credit card | Total consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 5,675 | 6,215
Credit card | Total consumer | Current or Less Than 30 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 5,561 | 6,074
Credit card | Total consumer | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 31 | 43
Credit card | Total consumer | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 24 | 30
Credit card | Total consumer | 90 Days Or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 52 | 60
Credit card | Total consumer | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 107 | 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 | 2,842 | 2,946
Education | Total consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 2,842 | 2,946
Education | Total consumer | Current or Less Than 30 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 2,692 | 2,785
Education | Total consumer | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 49 | 55
Education | Total consumer | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 25 | 29
Education | Total consumer | 90 Days Or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 76 | 77
Education | Total consumer | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 150 | 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 | 4,495 | 4,698
Other consumer | Total consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 4,495 | 4,698
Other consumer | Total consumer | Current or Less Than 30 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 4,464 | 4,656
Other consumer | Total consumer | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 11 | 14
Other consumer | Total consumer | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 6 | 10
Other consumer | Total consumer | 90 Days Or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 7 | 11
Other consumer | Total consumer | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 24 | 35
Other consumer | Total consumer | Nonperforming Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | $ 7 | $ 7

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