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Loans and Related Allowance for Credit Losses (Analysis of Loan Portfolio) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2018
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss | $ 239,843 | $ 241,928 | $ 226,245
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 | $ 1,100 | $ 1,300 |
Collateral Pledged |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due |  | 1,500 |
Other assets |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Accrued interest on loan portfolio |  | 700 |
Current or Less Than 30 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | $ 234,819 | $ 237,716 |
Percentage of total loans, past due | 97.90% | 98.27% |
30-59 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | $ 661 | $ 620 |
Percentage of total loans, past due | 0.28% | 0.26% |
60-89 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | $ 258 | $ 234 |
Percentage of total loans, past due | 0.11% | 0.10% |
90 Days Or More Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | $ 585 | $ 509 |
Percentage of total loans, past due | 0.24% | 0.21% |
Total Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | $ 1,504 | $ 1,363 |
Percentage of total loans, past due | 0.63% | 0.56% |
Nonperforming Loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss | $ 1,635 | $ 2,286 |
Percentage of total loans, past due | 0.68% | 0.94% |
Fair Value Option Nonaccrual Loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Nonaccrual loans | $ 166 | $ 563 |
Percentage of total loans, nonaccrual, past due | 0.07% | 0.23% |
Purchased Impaired Loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Purchased impaired loans | $ 1,719 |  |
Percentage of total loans, past due | 0.72% |  |
Commercial |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss | $ 160,602 | $ 167,203 | 152,282
Commercial | Current or Less Than 30 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 159,825 | 166,075 |
Commercial | 30-59 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 155 | 143 |
Commercial | 60-89 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 36 | 32 |
Commercial | 90 Days Or More Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 85 | 30 |
Commercial | Total Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 276 | 205 |
Commercial | Nonperforming Loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss | 501 | 923 |
Consumer |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss | 79,241 | 74,725 | $ 73,963
Consumer | Current or Less Than 30 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 74,994 | 71,641 |
Consumer | 30-59 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 506 | 477 |
Consumer | 60-89 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 222 | 202 |
Consumer | 90 Days Or More Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 500 | 479 |
Consumer | Total Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 1,228 | 1,158 |
Consumer | Nonperforming Loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss | 1,134 | 1,363 |
Consumer | Fair Value Option Nonaccrual Loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Nonaccrual loans | 166 | 563 |
Consumer | Purchased Impaired Loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Purchased impaired loans | 1,719 |  |
Commercial and industrial | Commercial |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss | 125,337 | 132,073 |
Commercial and industrial | Commercial | Current or Less Than 30 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 124,695 | 131,245 |
Commercial and industrial | Commercial | 30-59 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 102 | 106 |
Commercial and industrial | Commercial | 60-89 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 30 | 26 |
Commercial and industrial | Commercial | 90 Days Or More Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 85 | 30 |
Commercial and industrial | Commercial | Total Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 217 | 162 |
Commercial and industrial | Commercial | Nonperforming Loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss | 425 | 666 |
Commercial real estate | Commercial |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss | 28,110 | 28,716 |
Commercial real estate | Commercial | Current or Less Than 30 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 28,061 | 28,485 |
Commercial real estate | Commercial | 30-59 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 4 | 6 |
Commercial real estate | Commercial | 60-89 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 1 | 1 |
Commercial real estate | Commercial | Total Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 5 | 7 |
Commercial real estate | Commercial | Nonperforming Loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss | 44 | 224 |
Equipment lease financing | Commercial |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss | 7,155 | 6,414 |
Equipment lease financing | Commercial | Current or Less Than 30 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 7,069 | 6,345 |
Equipment lease financing | Commercial | 30-59 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 49 | 31 |
Equipment lease financing | Commercial | 60-89 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 5 | 5 |
Equipment lease financing | Commercial | Total Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 54 | 36 |
Equipment lease financing | Commercial | Nonperforming Loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss | 32 | 33 |
Home equity |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss | 25,085 | 24,088 |
Home equity | Consumer |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss | 25,085 | 24,088 |
Home equity | Consumer | Current or Less Than 30 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 23,791 | 23,318 |
Home equity | Consumer | 30-59 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 58 | 50 |
Home equity | Consumer | 60-89 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 24 | 21 |
Home equity | Consumer | Total Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 82 | 71 |
Home equity | Consumer | Nonperforming Loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss | 669 | 645 |
Home equity | Consumer | Fair Value Option Nonaccrual Loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Nonaccrual loans |  | 54 |
Home equity | Consumer | Purchased Impaired Loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Purchased impaired loans | 543 |  |
Residential real estate |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss | 21,821 | 22,560 |
Residential real estate | Government insured or guaranteed loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss | 584 | 922 |
Residential real estate | Consumer |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss | 21,821 | 22,560 |
Residential real estate | Consumer | Current or Less Than 30 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 19,640 | 20,945 |
Residential real estate | Consumer | 30-59 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 140 | 181 |
Residential real estate | Consumer | 60-89 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 69 | 78 |
Residential real estate | Consumer | 90 Days Or More Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 315 | 319 |
Residential real estate | Consumer | Total Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 524 | 578 |
Residential real estate | Consumer | Total Past Due | Government insured or guaranteed loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 400 |  |
Total loans, before allowance for credit loss |  | 400 |
Residential real estate | Consumer | Nonperforming Loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss | 315 | 528 |
Residential real estate | Consumer | Fair Value Option Nonaccrual Loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Nonaccrual loans | 166 | 509 |
Residential real estate | Consumer | Purchased Impaired Loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Purchased impaired loans | 1,176 |  |
Automobile | Consumer |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss | 16,754 | 14,218 |
Automobile | Consumer | Current or Less Than 30 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 16,376 | 13,863 |
Automobile | Consumer | 30-59 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 178 | 134 |
Automobile | Consumer | 60-89 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 47 | 34 |
Automobile | Consumer | 90 Days Or More Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 18 | 12 |
Automobile | Consumer | Total Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 243 | 180 |
Automobile | Consumer | Nonperforming Loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss | 135 | 175 |
Credit card |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss | 7,308 |  |
Credit card | Consumer |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss | 7,308 | 6,215 |
Credit card | Consumer | Current or Less Than 30 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 7,133 | 6,074 |
Credit card | Consumer | 30-59 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 60 | 43 |
Credit card | Consumer | 60-89 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 37 | 30 |
Credit card | Consumer | 90 Days Or More Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 67 | 60 |
Credit card | Consumer | Total Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 164 | 133 |
Credit card | Consumer | Nonperforming Loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss | 11 | 8 |
Education |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss | 3,336 | 2,946 |
Education | Consumer |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss | 3,336 | 2,946 |
Education | Consumer | Current or Less Than 30 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 3,156 | 2,785 |
Education | Consumer | 30-59 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 55 | 55 |
Education | Consumer | 60-89 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 34 | 29 |
Education | Consumer | 90 Days Or More Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 91 | 77 |
Education | Consumer | Total Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 180 | 161 |
Education | Consumer | Total Past Due | Government insured or guaranteed loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 200 |  |
Total loans, before allowance for credit loss |  | 200 |
Other consumer |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss | 4,937 | 4,698 |
Other consumer | Consumer |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss | 4,937 | 4,698 |
Other consumer | Consumer | Current or Less Than 30 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 4,898 | 4,656 |
Other consumer | Consumer | 30-59 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 15 | 14 |
Other consumer | Consumer | 60-89 Days Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 11 | 10 |
Other consumer | Consumer | 90 Days Or More Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 9 | 11 |
Other consumer | Consumer | Total Past Due |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, past due | 35 | 35 |
Other consumer | Consumer | Nonperforming Loans |  |  |
Financing Receivable. Recorded Investment, Past Due [Line Items] |  |  |
Total loans, before allowance for credit loss | $ 4 | $ 7 |

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