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Loans and Related Allowance for Credit Losses (Commercial Lending Asset Quality Indicators) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans | $ 241,928 | $ 239,843 | $ 226,245
Commercial |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 37,554 |  |
2019 | 22,152 |  |
2018 | 13,389 |  |
2017 | 10,331 |  |
2016 | 7,634 |  |
Prior | 16,824 |  |
Revolving Loans | 59,247 |  |
Revolving Loans Converted to Term | 72 |  |
Total Loans | 167,203 | 160,602 | $ 152,282
Commercial | Commercial and industrial |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 32,019 |  |
2019 | 14,042 |  |
2018 | 8,787 |  |
2017 | 6,290 |  |
2016 | 4,466 |  |
Prior | 7,492 |  |
Revolving Loans | 58,905 |  |
Revolving Loans Converted to Term | 72 |  |
Total Loans | 132,073 | 125,337 |
Commercial | Commercial real estate |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 4,028 |  |
2019 | 6,816 |  |
2018 | 3,574 |  |
2017 | 3,264 |  |
2016 | 2,741 |  |
Prior | 7,951 |  |
Revolving Loans | 342 |  |
Revolving Loans Converted to Term |  |  |
Total Loans | 28,716 | 28,110 |
Commercial | Equipment lease financing |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 1,507 |  |
2019 | 1,294 |  |
2018 | 1,028 |  |
2017 | 777 |  |
2016 | 427 |  |
Prior | 1,381 |  |
Total Loans | 6,414 | 7,155 |
Pass Rated | Commercial |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 154,076 |
Pass Rated | Commercial | Commercial and industrial |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 31,680 |  |
2019 | 13,340 |  |
2018 | 8,209 |  |
2017 | 5,956 |  |
2016 | 4,242 |  |
Prior | 7,141 |  |
Revolving Loans | 54,775 |  |
Revolving Loans Converted to Term | 53 |  |
Total Loans | 125,396 | 119,761 |
Pass Rated | Commercial | Commercial real estate |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 3,709 |  |
2019 | 6,268 |  |
2018 | 3,426 |  |
2017 | 2,841 |  |
2016 | 2,341 |  |
Prior | 6,792 |  |
Revolving Loans | 218 |  |
Total Loans | 25,595 | 27,424 |
Pass Rated | Commercial | Equipment lease financing |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 1,429 |  |
2019 | 1,202 |  |
2018 | 942 |  |
2017 | 738 |  |
2016 | 405 |  |
Prior | 1,350 |  |
Total Loans | 6,066 | 6,891 |
Criticized | Commercial |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 6,526 |
Criticized | Commercial | Commercial and industrial |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 339 |  |
2019 | 702 |  |
2018 | 578 |  |
2017 | 334 |  |
2016 | 224 |  |
Prior | 351 |  |
Revolving Loans | 4,130 |  |
Revolving Loans Converted to Term | 19 |  |
Total Loans | 6,677 | 5,576 |
Criticized | Commercial | Commercial real estate |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 319 |  |
2019 | 548 |  |
2018 | 148 |  |
2017 | 423 |  |
2016 | 400 |  |
Prior | 1,159 |  |
Revolving Loans | 124 |  |
Total Loans | 3,121 | 686 |
Criticized | Commercial | Equipment lease financing |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 78 |  |
2019 | 92 |  |
2018 | 86 |  |
2017 | 39 |  |
2016 | 22 |  |
Prior | 31 |  |
Total Loans | $ 348 | $ 264 |

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