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Loans and Related Allowance for Credit Losses (Consumer Real Estate Secured 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
Home equity |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 3,434 |  |
2019 | 2,000 |  |
2018 | 590 |  |
2017 | 830 |  |
2016 | 694 |  |
Prior | 4,000 |  |
Revolving Loans | 8,794 |  |
Revolving Loans Converted to Term | 3,746 |  |
Total Loans | 24,088 | 25,085 |
Home equity | FICO Score, Greater Than Or Equal To 780 |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 2,019 |  |
2019 | 1,094 |  |
2018 | 311 |  |
2017 | 525 |  |
2016 | 449 |  |
Prior | 2,467 |  |
Revolving Loans | 5,382 |  |
Revolving Loans Converted to Term | 1,480 |  |
Total Loans | 13,727 |  |
Home equity | FICO Score, 720 to 779 |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 1,028 |  |
2019 | 558 |  |
2018 | 153 |  |
2017 | 181 |  |
2016 | 145 |  |
Prior | 777 |  |
Revolving Loans | 2,137 |  |
Revolving Loans Converted to Term | 941 |  |
Total Loans | 5,920 |  |
Home equity | FICO Score, 660 to 719 |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 334 |  |
2019 | 273 |  |
2018 | 86 |  |
2017 | 84 |  |
2016 | 66 |  |
Prior | 402 |  |
Revolving Loans | 985 |  |
Revolving Loans Converted to Term | 625 |  |
Total Loans | 2,855 |  |
Home equity | FICO Score, Less Than 660 |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 52 |  |
2019 | 74 |  |
2018 | 39 |  |
2017 | 39 |  |
2016 | 33 |  |
Prior | 345 |  |
Revolving Loans | 277 |  |
Revolving Loans Converted to Term | 620 |  |
Total Loans | 1,479 |  |
Home equity | FICO Score- Greater than 660 |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 22,245 |
Home equity | FICO Score- Less than or equal to 660 |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 2,019 |
Home equity | No FICO score available |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 1 |  |
2019 | 1 |  |
2018 | 1 |  |
2017 | 1 |  |
2016 | 1 |  |
Prior | 9 |  |
Revolving Loans | 13 |  |
Revolving Loans Converted to Term | 80 |  |
Total Loans | 107 | 278 |
Home equity | Purchased Impaired Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 543 |
Home equity | Greater than 100% |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 8 |  |
2019 | 44 |  |
2018 | 18 |  |
2017 | 15 |  |
2016 | 9 |  |
Prior | 88 |  |
Revolving Loans | 580 |  |
Revolving Loans Converted to Term | 279 |  |
Total Loans | 1,041 |  |
Home equity | Greater than or equal to 80% to 100% |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 517 |  |
2019 | 320 |  |
2018 | 59 |  |
2017 | 42 |  |
2016 | 25 |  |
Prior | 158 |  |
Revolving Loans | 1,781 |  |
Revolving Loans Converted to Term | 591 |  |
Total Loans | 3,493 |  |
Home equity | Less than 80% |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 2,909 |  |
2019 | 1,636 |  |
2018 | 513 |  |
2017 | 773 |  |
2016 | 660 |  |
Prior | 3,754 |  |
Revolving Loans | 6,433 |  |
Revolving Loans Converted to Term | 2,876 |  |
Total Loans | 19,554 |  |
Home equity | Greater than or equal to 100% |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 1,243 |
Home equity | Greater than or equal to 90% to less than 100% |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 1,047 |
Home equity | Less than 90% |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 22,068 |
Home equity | No LTV ratio available |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 184 |
Residential real estate |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 7,996 |  |
2019 | 4,158 |  |
2018 | 1,172 |  |
2017 | 1,942 |  |
2016 | 2,069 |  |
Prior | 5,223 |  |
Total Loans | 22,560 | 21,821 |
Residential real estate | FICO Score, Greater Than Or Equal To 780 |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 5,425 |  |
2019 | 3,099 |  |
2018 | 814 |  |
2017 | 1,432 |  |
2016 | 1,538 |  |
Prior | 2,551 |  |
Total Loans | 14,859 |  |
Residential real estate | FICO Score, 720 to 779 |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 2,268 |  |
2019 | 820 |  |
2018 | 220 |  |
2017 | 340 |  |
2016 | 335 |  |
Prior | 818 |  |
Total Loans | 4,801 |  |
Residential real estate | FICO Score, 660 to 719 |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 252 |  |
2019 | 161 |  |
2018 | 76 |  |
2017 | 98 |  |
2016 | 92 |  |
Prior | 475 |  |
Total Loans | 1,154 |  |
Residential real estate | FICO Score, Less Than 660 |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 40 |  |
2019 | 48 |  |
2018 | 33 |  |
2017 | 31 |  |
2016 | 41 |  |
Prior | 485 |  |
Total Loans | 678 |  |
Residential real estate | FICO Score- Greater than 660 |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 19,341 |
Residential real estate | FICO Score- Less than or equal to 660 |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 569 |
Residential real estate | No FICO score available |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 4 |  |
2019 | 2 |  |
2018 | 2 |  |
2017 | 3 |  |
2016 | 6 |  |
Prior | 129 |  |
Total Loans | 146 | 151 |
Residential real estate | Purchased Impaired Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 1,176 |
Residential real estate | Government insured or guaranteed loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 7 |  |
2019 | 28 |  |
2018 | 27 |  |
2017 | 38 |  |
2016 | 57 |  |
Prior | 765 |  |
Total Loans | 922 | 584 |
Residential real estate | Greater than 100% |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 3 |  |
2019 | 52 |  |
2018 | 26 |  |
2017 | 42 |  |
2016 | 41 |  |
Prior | 160 |  |
Total Loans | 324 |  |
Residential real estate | Greater than or equal to 80% to 100% |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 495 |  |
2019 | 422 |  |
2018 | 127 |  |
2017 | 156 |  |
2016 | 124 |  |
Prior | 307 |  |
Total Loans | 1,631 |  |
Residential real estate | Less than 80% |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 7,491 |  |
2019 | 3,656 |  |
2018 | 992 |  |
2017 | 1,706 |  |
2016 | 1,847 |  |
Prior | 3,991 |  |
Total Loans | $ 19,683 |  |
Residential real estate | Greater than or equal to 100% |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 333 |
Residential real estate | Greater than or equal to 90% to less than 100% |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 340 |
Residential real estate | Less than 90% |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 19,305 |
Residential real estate | No LTV ratio available |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | $ 83 |

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