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Loans and Related Allowance for Credit Losses (Credit Quality Indicators for Automobile, Credit Card, Education and Other Consumer Loan Classes) (Details) $ in Millions | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
--- | --- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans | $ 241,928 | $ 239,843 | $ 226,245
Automobile |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 16,754 |
Automobile | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 3,714 |  |
2019 | 5,494 |  |
2018 | 2,878 |  |
2017 | 1,361 |  |
2016 | 609 |  |
Prior | 162 |  |
Total Loans | 14,218 | $ 16,754 |
Weighted average FICO score |  | 726 |
Automobile | FICO Score, Greater Than Or Equal To 780 | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 1,807 |  |
2019 | 1,915 |  |
2018 | 807 |  |
2017 | 452 |  |
2016 | 246 |  |
Prior | 58 |  |
Total Loans | 5,285 |  |
Automobile | FICO Score, 720 to 779 | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 1,098 |  |
2019 | 1,581 |  |
2018 | 789 |  |
2017 | 381 |  |
2016 | 167 |  |
Prior | 44 |  |
Total Loans | 4,060 |  |
Automobile | FICO Score, 660 to 719 | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 617 |  |
2019 | 1,222 |  |
2018 | 684 |  |
2017 | 288 |  |
2016 | 109 |  |
Prior | 31 |  |
Total Loans | 2,951 |  |
Automobile | FICO Score, Less Than 660 | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 192 |  |
2019 | 776 |  |
2018 | 598 |  |
2017 | 240 |  |
2016 | 87 |  |
Prior | 29 |  |
Total Loans | 1,922 |  |
Automobile | No FICO Score Available Or Required | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | $ 341 |
Automobile | FICO Score - Greater than 719 | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 9,232 |
Automobile | FICO Score - 650 to 719 | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 4,577 |
Automobile | FICO Score - 620 to 649 | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 1,001 |
Automobile | FICO Score - Less than 620 | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 1,603 |
Credit card |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 7,308 |
Credit card | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Revolving Loans | 6,120 |  |
Revolving Loans Converted to Term | 95 |  |
Total Loans | 6,215 | $ 7,308 |
Weighted average FICO score |  | 724 |
Credit card | FICO Score, Greater Than Or Equal To 780 | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Revolving Loans | 1,635 |  |
Revolving Loans Converted to Term | 3 |  |
Total Loans | 1,638 |  |
Credit card | FICO Score, 720 to 779 | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Revolving Loans | 1,724 |  |
Revolving Loans Converted to Term | 11 |  |
Total Loans | 1,735 |  |
Credit card | FICO Score, 660 to 719 | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Revolving Loans | 1,765 |  |
Revolving Loans Converted to Term | 26 |  |
Total Loans | 1,791 |  |
Credit card | FICO Score, Less Than 660 | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Revolving Loans | 902 |  |
Revolving Loans Converted to Term | 51 |  |
Total Loans | 953 |  |
Credit card | No FICO Score Available Or Required | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Revolving Loans | 94 |  |
Revolving Loans Converted to Term | 4 |  |
Total Loans | 98 | $ 152 |
Credit card | FICO Score - Greater than 719 | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 3,867 |
Credit card | FICO Score - 650 to 719 | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 2,326 |
Credit card | FICO Score - 620 to 649 | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 419 |
Credit card | FICO Score - Less than 620 | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 544 |
Education |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 92 |  |
2019 | 163 |  |
2018 | 135 |  |
2017 | 101 |  |
2016 | 78 |  |
Prior | 2,377 |  |
Total Loans | 2,946 | 3,336 |
Education | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 92 |  |
2019 | 163 |  |
2018 | 135 |  |
2017 | 101 |  |
2016 | 78 |  |
Prior | 746 |  |
Total Loans | 1,315 | $ 1,403 |
Weighted average FICO score |  | 773 |
Education | FICO Score, Greater Than Or Equal To 780 | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 34 |  |
2019 | 90 |  |
2018 | 74 |  |
2017 | 59 |  |
2016 | 50 |  |
Prior | 428 |  |
Total Loans | 735 |  |
Education | FICO Score, 720 to 779 | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 24 |  |
2019 | 46 |  |
2018 | 38 |  |
2017 | 28 |  |
2016 | 20 |  |
Prior | 190 |  |
Total Loans | 346 |  |
Education | FICO Score, 660 to 719 | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 15 |  |
2019 | 15 |  |
2018 | 14 |  |
2017 | 9 |  |
2016 | 6 |  |
Prior | 90 |  |
Total Loans | 149 |  |
Education | FICO Score, Less Than 660 | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 3 |  |
2019 | 2 |  |
2018 | 3 |  |
2017 | 2 |  |
2016 | 2 |  |
Prior | 37 |  |
Total Loans | 49 |  |
Education | No FICO Score Available Or Required | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 16 |  |
2019 | 10 |  |
2018 | 6 |  |
2017 | 3 |  |
2016 |  |  |
Prior | 1 |  |
Total Loans | 36 | $ 15 |
Education | Other Internal Credit Metrics |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Prior | 1,631 |  |
Total Loans | 1,631 | 1,933 |
Education | FICO Score - Greater than 719 | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 1,139 |
Education | FICO Score - 650 to 719 | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 197 |
Education | FICO Score - 620 to 649 | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 25 |
Education | FICO Score - Less than 620 | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 27 |
Other consumer |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 581 |  |
2019 | 763 |  |
2018 | 304 |  |
2017 | 95 |  |
2016 | 75 |  |
Prior | 161 |  |
Revolving Loans | 2,713 |  |
Revolving Loans Converted to Term | 6 |  |
Total Loans | 4,698 | 4,937 |
Other consumer | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 514 |  |
2019 | 730 |  |
2018 | 267 |  |
2017 | 69 |  |
2016 | 15 |  |
Prior | 86 |  |
Revolving Loans | 379 |  |
Revolving Loans Converted to Term | 3 |  |
Total Loans | 2,063 | $ 2,566 |
Weighted average FICO score |  | 727 |
Other consumer | FICO Score, Greater Than Or Equal To 780 | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 162 |  |
2019 | 187 |  |
2018 | 63 |  |
2017 | 21 |  |
2016 | 5 |  |
Prior | 42 |  |
Revolving Loans | 86 |  |
Revolving Loans Converted to Term | 1 |  |
Total Loans | 567 |  |
Other consumer | FICO Score, 720 to 779 | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 197 |  |
2019 | 247 |  |
2018 | 82 |  |
2017 | 22 |  |
2016 | 5 |  |
Prior | 22 |  |
Revolving Loans | 123 |  |
Total Loans | 698 |  |
Other consumer | FICO Score, 660 to 719 | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 127 |  |
2019 | 210 |  |
2018 | 81 |  |
2017 | 17 |  |
2016 | 3 |  |
Prior | 14 |  |
Revolving Loans | 117 |  |
Revolving Loans Converted to Term | 1 |  |
Total Loans | 570 |  |
Other consumer | FICO Score, Less Than 660 | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 28 |  |
2019 | 86 |  |
2018 | 41 |  |
2017 | 9 |  |
2016 | 2 |  |
Prior | 8 |  |
Revolving Loans | 53 |  |
Revolving Loans Converted to Term | 1 |  |
Total Loans | 228 |  |
Other consumer | No FICO Score Available Or Required | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | $ 27 |
Other consumer | Other Internal Credit Metrics |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 67 |  |
2019 | 33 |  |
2018 | 37 |  |
2017 | 26 |  |
2016 | 60 |  |
Prior | 75 |  |
Revolving Loans | 2,334 |  |
Revolving Loans Converted to Term | 3 |  |
Total Loans | $ 2,635 | 2,371 |
Other consumer | FICO Score - Greater than 719 | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 1,421 |
Other consumer | FICO Score - 650 to 719 | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 843 |
Other consumer | FICO Score - 620 to 649 | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 132 |
Other consumer | FICO Score - Less than 620 | Using FICO Credit Metric |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | $ 143 |

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