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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) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total Loans | $ 237,013 | $ 241,928
Automobile | Using FICO Credit Metric |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 1,084 | 3,714
Financing receivable, originated in year one | 3,431 | 5,494
Financing receivable, originated in year two | 4,880 | 2,878
Financing receivable, originated in year three | 2,491 | 1,361
Financing receivable, originated in year four | 1,130 | 609
Prior | 568 | 162
Total Loans | 13,584 | 14,218
Automobile | Greater than or equal to 780 | Using FICO Credit Metric |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 775 | 1,807
Financing receivable, originated in year one | 1,545 | 1,915
Financing receivable, originated in year two | 1,701 | 807
Financing receivable, originated in year three | 688 | 452
Financing receivable, originated in year four | 362 | 246
Prior | 216 | 58
Total Loans | 5,287 | 5,285
Automobile | 720 to 779 | Using FICO Credit Metric |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 242 | 1,098
Financing receivable, originated in year one | 1,067 | 1,581
Financing receivable, originated in year two | 1,380 | 789
Financing receivable, originated in year three | 678 | 381
Financing receivable, originated in year four | 320 | 167
Prior | 157 | 44
Total Loans | 3,844 | 4,060
Automobile | 660 to 719 | Using FICO Credit Metric |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 63 | 617
Financing receivable, originated in year one | 591 | 1,222
Financing receivable, originated in year two | 1,076 | 684
Financing receivable, originated in year three | 590 | 288
Financing receivable, originated in year four | 240 | 109
Prior | 106 | 31
Total Loans | 2,666 | 2,951
Automobile | Less than 660 | Using FICO Credit Metric |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 4 | 192
Financing receivable, originated in year one | 228 | 776
Financing receivable, originated in year two | 723 | 598
Financing receivable, originated in year three | 535 | 240
Financing receivable, originated in year four | 208 | 87
Prior | 89 | 29
Total Loans | 1,787 | 1,922
Credit card | Using FICO Credit Metric |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Revolving Loans | 5,586 | 6,120
Revolving Loans Converted to Term | 89 | 95
Total Loans | 5,675 | 6,215
Credit card | Greater than or equal to 780 | Using FICO Credit Metric |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Revolving Loans | 1,513 | 1,635
Revolving Loans Converted to Term | 3 | 3
Total Loans | 1,516 | 1,638
Credit card | 720 to 779 | Using FICO Credit Metric |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Revolving Loans | 1,541 | 1,724
Revolving Loans Converted to Term | 11 | 11
Total Loans | 1,552 | 1,735
Credit card | 660 to 719 | Using FICO Credit Metric |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Revolving Loans | 1,621 | 1,765
Revolving Loans Converted to Term | 25 | 26
Total Loans | 1,646 | 1,791
Credit card | Less than 660 | Using FICO Credit Metric |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Revolving Loans | 817 | 902
Revolving Loans Converted to Term | 46 | 51
Total Loans | 863 | 953
Credit card | No FICO Score Available Or Required | Using FICO Credit Metric |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Revolving Loans | 94 | 94
Revolving Loans Converted to Term | 4 | 4
Total Loans | 98 | 98
Education |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 13 | 92
Financing receivable, originated in year one | 121 | 163
Financing receivable, originated in year two | 156 | 135
Financing receivable, originated in year three | 128 | 101
Financing receivable, originated in year four | 95 | 78
Prior | 2,329 | 2,377
Total Loans | 2,842 | 2,946
Education | Using FICO Credit Metric |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 13 | 92
Financing receivable, originated in year one | 121 | 163
Financing receivable, originated in year two | 156 | 135
Financing receivable, originated in year three | 128 | 101
Financing receivable, originated in year four | 95 | 78
Prior | 778 | 746
Total Loans | 1,291 | 1,315
Education | Greater than or equal to 780 | Using FICO Credit Metric |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 1 | 34
Financing receivable, originated in year one | 64 | 90
Financing receivable, originated in year two | 86 | 74
Financing receivable, originated in year three | 70 | 59
Financing receivable, originated in year four | 55 | 50
Prior | 450 | 428
Total Loans | 726 | 735
Education | 720 to 779 | Using FICO Credit Metric |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 4 | 24
Financing receivable, originated in year one | 34 | 46
Financing receivable, originated in year two | 44 | 38
Financing receivable, originated in year three | 37 | 28
Financing receivable, originated in year four | 27 | 20
Prior | 202 | 190
Total Loans | 348 | 346
Education | 660 to 719 | Using FICO Credit Metric |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 4 | 15
Financing receivable, originated in year one | 10 | 15
Financing receivable, originated in year two | 14 | 14
Financing receivable, originated in year three | 14 | 9
Financing receivable, originated in year four | 8 | 6
Prior | 90 | 90
Total Loans | 140 | 149
Education | Less than 660 | Using FICO Credit Metric |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 1 | 3
Financing receivable, originated in year one | 1 | 2
Financing receivable, originated in year two | 3 | 3
Financing receivable, originated in year three | 2 | 2
Financing receivable, originated in year four | 2 | 2
Prior | 35 | 37
Total Loans | 44 | 49
Education | No FICO Score Available Or Required | Using FICO Credit Metric |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 3 | 16
Financing receivable, originated in year one | 12 | 10
Financing receivable, originated in year two | 9 | 6
Financing receivable, originated in year three | 5 | 3
Financing receivable, originated in year four | 3 |
Prior | 1 | 1
Total Loans | 33 | 36
Education | Other internal credit metrics |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year |  |
Financing receivable, originated in year one |  |
Prior | 1,551 | 1,631
Total Loans | 1,551 | 1,631
Other consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 124 | 581
Financing receivable, originated in year one | 478 | 763
Financing receivable, originated in year two | 650 | 304
Financing receivable, originated in year three | 245 | 95
Financing receivable, originated in year four | 77 | 75
Prior | 210 | 161
Revolving Loans | 2,701 | 2,713
Revolving Loans Converted to Term | 10 | 6
Total Loans | 4,495 | 4,698
Other consumer | Using FICO Credit Metric |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 92 | 514
Financing receivable, originated in year one | 449 | 730
Financing receivable, originated in year two | 622 | 267
Financing receivable, originated in year three | 216 | 69
Financing receivable, originated in year four | 51 | 15
Prior | 84 | 86
Revolving Loans | 336 | 379
Revolving Loans Converted to Term | 2 | 3
Total Loans | 1,852 | 2,063
Other consumer | Greater than or equal to 780 | Using FICO Credit Metric |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 31 | 162
Financing receivable, originated in year one | 135 | 187
Financing receivable, originated in year two | 150 | 63
Financing receivable, originated in year three | 49 | 21
Financing receivable, originated in year four | 15 | 5
Prior | 40 | 42
Revolving Loans | 73 | 86
Revolving Loans Converted to Term | 1 | 1
Total Loans | 494 | 567
Other consumer | 720 to 779 | Using FICO Credit Metric |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 33 | 197
Financing receivable, originated in year one | 169 | 247
Financing receivable, originated in year two | 206 | 82
Financing receivable, originated in year three | 65 | 22
Financing receivable, originated in year four | 16 | 5
Prior | 23 | 22
Revolving Loans | 109 | 123
Revolving Loans Converted to Term |  |
Total Loans | 621 | 698
Other consumer | 660 to 719 | Using FICO Credit Metric |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 27 | 127
Financing receivable, originated in year one | 111 | 210
Financing receivable, originated in year two | 185 | 81
Financing receivable, originated in year three | 68 | 17
Financing receivable, originated in year four | 13 | 3
Prior | 14 | 14
Revolving Loans | 107 | 117
Revolving Loans Converted to Term |  | 1
Total Loans | 525 | 570
Other consumer | Less than 660 | Using FICO Credit Metric |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 1 | 28
Financing receivable, originated in year one | 34 | 86
Financing receivable, originated in year two | 81 | 41
Financing receivable, originated in year three | 34 | 9
Financing receivable, originated in year four | 7 | 2
Prior | 7 | 8
Revolving Loans | 47 | 53
Revolving Loans Converted to Term | 1 | 1
Total Loans | 212 | 228
Other consumer | Other internal credit metrics |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 32 | 67
Financing receivable, originated in year one | 29 | 33
Financing receivable, originated in year two | 28 | 37
Financing receivable, originated in year three | 29 | 26
Financing receivable, originated in year four | 26 | 60
Prior | 126 | 75
Revolving Loans | 2,365 | 2,334
Revolving Loans Converted to Term | 8 | 3
Total Loans | $ 2,643 | $ 2,635

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