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Loans and Related Allowance for Credit Losses (Analysis of Loan Portfolio) (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | $ 294,704 | $ 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 | $ 1,000 | $ 1,300
Collateral Dependent |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 1,900 | 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 | $ 289,912 | $ 237,716
Percentage of total loans, past due | 98.37% | 98.27%
30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | $ 548 | $ 620
Percentage of total loans, past due | 0.19% | 0.26%
60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | $ 215 | $ 234
Percentage of total loans, past due | 0.07% | 0.10%
90 Days Or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | $ 527 | $ 509
Percentage of total loans, past due | 0.18% | 0.21%
Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | $ 1,290 | $ 1,363
Percentage of total loans, past due | 0.44% | 0.56%
Nonperforming Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | $ 2,779 | $ 2,286
Percentage of total loans, past due | 0.94% | 0.94%
Fair Value Option Nonaccrual Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans | $ 723 | $ 563
Percentage of total loans, nonaccrual, past due | 0.25% | 0.23%
Total commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | $ 199,640 | $ 167,203
Total commercial | Current or Less Than 30 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 198,033 | 166,075
Total commercial | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 80 | 143
Total commercial | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 34 | 32
Total commercial | 90 Days Or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 47 | 30
Total commercial | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 161 | 205
Total commercial | Nonperforming Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 1,446 | 923
Total consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 95,064 | 74,725
Total consumer | Current or Less Than 30 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 91,879 | 71,641
Total consumer | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 468 | 477
Total consumer | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 181 | 202
Total consumer | 90 Days Or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 480 | 479
Total consumer | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 1,129 | 1,158
Total consumer | Nonperforming Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 1,333 | 1,363
Total consumer | Fair Value Option Nonaccrual Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans | 723 | 563
Commercial and industrial | Total commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 155,300 | 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 | 154,226 | 131,245
Commercial and industrial | Total commercial | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 72 | 106
Commercial and industrial | Total commercial | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 27 | 26
Commercial and industrial | Total commercial | 90 Days Or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 45 | 30
Commercial and industrial | Total commercial | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 144 | 162
Commercial and industrial | Total commercial | Nonperforming Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 930 | 666
Commercial real estate | Total commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 37,964 | 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 | 37,453 | 28,485
Commercial real estate | Total commercial | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 5 | 6
Commercial real estate | Total commercial | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 3 | 1
Commercial real estate | Total commercial | 90 Days Or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 2 |
Commercial real estate | Total commercial | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 10 | 7
Commercial real estate | Total commercial | Nonperforming Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 501 | 224
Equipment lease financing | Total commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 6,376 | 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 | 6,354 | 6,345
Equipment lease financing | Total commercial | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 3 | 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 | 7 | 36
Equipment lease financing | Total commercial | Nonperforming Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 15 | 33
Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 36,846 | 22,560
Residential real estate | Government insured or guaranteed loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 942 | 922
Residential real estate | Total consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 36,846 | 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 | 35,099 | 20,945
Residential real estate | Total consumer | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 212 | 181
Residential real estate | Total consumer | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 82 | 78
Residential real estate | Total consumer | 90 Days Or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 337 | 319
Residential real estate | Total consumer | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 631 | 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 | 503 | 528
Residential real estate | Total consumer | Fair Value Option Nonaccrual Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans | 613 | 509
Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 25,174 | 24,088
Home equity | Total consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 25,174 | 24,088
Home equity | Total consumer | Current or Less Than 30 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 24,377 | 23,318
Home equity | Total consumer | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 44 | 50
Home equity | Total consumer | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 17 | 21
Home equity | Total consumer | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 61 | 71
Home equity | Total consumer | Nonperforming Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 626 | 645
Home equity | Total consumer | Fair Value Option Nonaccrual Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans | 110 | 54
Automobile | Total consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 17,551 | 14,218
Automobile | Total consumer | Current or Less Than 30 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 17,239 | 13,863
Automobile | Total consumer | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 98 | 134
Automobile | Total consumer | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 20 | 34
Automobile | Total consumer | 90 Days Or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 3 | 12
Automobile | Total consumer | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 121 | 180
Automobile | Total consumer | Nonperforming Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 191 | 175
Credit card | Total consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 6,528 | 6,215
Credit card | Total consumer | Current or Less Than 30 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 6,401 | 6,074
Credit card | Total consumer | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 37 | 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 | 59 | 60
Credit card | Total consumer | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 120 | 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 | 2,726 | 2,946
Education | Total consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 2,726 | 2,946
Education | Total consumer | Current or Less Than 30 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 2,591 | 2,785
Education | Total consumer | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 46 | 55
Education | Total consumer | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 22 | 29
Education | Total consumer | 90 Days Or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 67 | 77
Education | Total consumer | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 135 | 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 | 6,239 | 4,698
Other consumer | Total consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | 6,239 | 4,698
Other consumer | Total consumer | Current or Less Than 30 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 6,172 | 4,656
Other consumer | Total consumer | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 31 | 14
Other consumer | Total consumer | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 16 | 10
Other consumer | Total consumer | 90 Days Or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 14 | 11
Other consumer | Total consumer | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, past due | 61 | 35
Other consumer | Total consumer | Nonperforming Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, before allowance for credit loss | $ 6 | $ 7

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