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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 | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Total loans, net | [1] | $ 321,508 | $ 326,025 |
Gross charge-offs |  |  |  |
Total |  | 1,092 | 985 | $ 1,101
Automobile |  |  |  |
Gross charge-offs |  |  |  |
Year One |  | 8 |  |
Year Two |  | 24 |  |
Year Three |  | 22 |  |
Year Four |  | 17 |  |
Year Five |  | 30 |  |
Prior |  | 20 |  |
Total |  | 121 |  |
Automobile | Using FICO Credit Metric |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 5,797 | 5,139 |
Year two |  | 3,630 | 4,424 |
Year three |  | 2,912 | 2,054 |
Year four |  | 1,174 | 2,067 |
Year five |  | 1,004 | 878 |
Prior |  | 343 | 274 |
Total loans, net |  | 14,860 | 14,836 |
Automobile | FICO Score, Greater Than Or Equal To 780 | Using FICO Credit Metric |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 2,722 | 2,390 |
Year two |  | 1,650 | 2,162 |
Year three |  | 1,483 | 922 |
Year four |  | 535 | 760 |
Year five |  | 368 | 241 |
Prior |  | 88 | 75 |
Total loans, net |  | 6,846 | 6,550 |
Automobile | FICO Score, 720 to 779 | Using FICO Credit Metric |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 1,797 | 1,702 |
Year two |  | 1,104 | 1,312 |
Year three |  | 778 | 561 |
Year four |  | 301 | 538 |
Year five |  | 250 | 222 |
Prior |  | 80 | 69 |
Total loans, net |  | 4,310 | 4,404 |
Automobile | FICO Score, 660 to 719 | Using FICO Credit Metric |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 1,014 | 854 |
Year two |  | 604 | 660 |
Year three |  | 408 | 341 |
Year four |  | 186 | 401 |
Year five |  | 186 | 187 |
Prior |  | 70 | 56 |
Total loans, net |  | 2,468 | 2,499 |
Automobile | FICO Score, Less Than 660 | Using FICO Credit Metric |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 264 | 193 |
Year two |  | 272 | 290 |
Year three |  | 243 | 230 |
Year four |  | 152 | 368 |
Year five |  | 200 | 228 |
Prior |  | 105 | 74 |
Total loans, net |  | 1,236 | 1,383 |
Credit card |  |  |  |
Gross charge-offs |  |  |  |
Revolving Loans |  | 290 |  |
Revolving Loans Converted to Term |  | 29 |  |
Total |  | 319 |  |
Credit card | Using FICO Credit Metric |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Revolving Loans |  | 7,111 | 7,010 |
Revolving Loans Converted to Term |  | 69 | 59 |
Total loans, net |  | 7,180 | 7,069 |
Credit card | FICO Score, Greater Than Or Equal To 780 | Using FICO Credit Metric |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Revolving Loans |  | 2,017 | 1,954 |
Revolving Loans Converted to Term |  | 1 | 2 |
Total loans, net |  | 2,018 | 1,956 |
Credit card | FICO Score, 720 to 779 | Using FICO Credit Metric |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Revolving Loans |  | 1,976 | 1,994 |
Revolving Loans Converted to Term |  | 4 | 6 |
Total loans, net |  | 1,980 | 2,000 |
Credit card | FICO Score, 660 to 719 | Using FICO Credit Metric |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Revolving Loans |  | 1,979 | 1,957 |
Revolving Loans Converted to Term |  | 13 | 13 |
Total loans, net |  | 1,992 | 1,970 |
Credit card | FICO Score, Less Than 660 | Using FICO Credit Metric |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Revolving Loans |  | 1,036 | 1,001 |
Revolving Loans Converted to Term |  | 48 | 35 |
Total loans, net |  | 1,084 | 1,036 |
Credit card | No FICO Score Available Or Required | Using FICO Credit Metric |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Revolving Loans |  | 103 | 104 |
Revolving Loans Converted to Term |  | 3 | 3 |
Total loans, net |  | 106 | 107 |
Education |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 106 | 126 |
Year two |  | 160 | 97 |
Year three |  | 83 | 88 |
Year four |  | 68 | 105 |
Year five |  | 85 | 85 |
Prior |  | 1,443 | 1,672 |
Total loans, net |  | 1,945 | 2,173 |
Gross charge-offs |  |  |  |
Year Three |  | 1 |  |
Year Four |  | 1 |  |
Year Five |  | 2 |  |
Prior |  | 13 |  |
Total |  | 17 |  |
Education | Using FICO Credit Metric |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 106 | 126 |
Year two |  | 160 | 97 |
Year three |  | 83 | 88 |
Year four |  | 68 | 105 |
Year five |  | 85 | 85 |
Prior |  | 538 | 584 |
Total loans, net |  | 1,040 | 1,085 |
Education | FICO Score, Greater Than Or Equal To 780 | Using FICO Credit Metric |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 35 | 42 |
Year two |  | 88 | 53 |
Year three |  | 45 | 48 |
Year four |  | 40 | 61 |
Year five |  | 51 | 51 |
Prior |  | 331 | 357 |
Total loans, net |  | 590 | 612 |
Education | FICO Score, 720 to 779 | Using FICO Credit Metric |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 32 | 39 |
Year two |  | 47 | 27 |
Year three |  | 24 | 24 |
Year four |  | 19 | 30 |
Year five |  | 24 | 24 |
Prior |  | 131 | 143 |
Total loans, net |  | 277 | 287 |
Education | FICO Score, 660 to 719 | Using FICO Credit Metric |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 20 | 21 |
Year two |  | 17 | 8 |
Year three |  | 8 | 8 |
Year four |  | 6 | 9 |
Year five |  | 8 | 8 |
Prior |  | 54 | 59 |
Total loans, net |  | 113 | 113 |
Education | FICO Score, Less Than 660 | Using FICO Credit Metric |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 4 | 4 |
Year two |  | 3 | 1 |
Year three |  | 2 | 1 |
Year four |  | 1 | 2 |
Year five |  | 2 | 2 |
Prior |  | 21 | 24 |
Total loans, net |  | 33 | 34 |
Education | No FICO Score Available Or Required | Using FICO Credit Metric |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 15 | 20 |
Year two |  | 5 | 8 |
Year three |  | 4 | 7 |
Year four |  | 2 | 3 |
Year five |  |  |  |
Prior |  | 1 | 1 |
Total loans, net |  | 27 | 39 |
Education | Other Internal Credit Metrics |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Prior |  | 905 | 1,088 |
Total loans, net |  | 905 | 1,088 |
Other consumer |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 712 | 912 |
Year two |  | 573 | 420 |
Year three |  | 222 | 266 |
Year four |  | 139 | 248 |
Year five |  | 137 | 89 |
Prior |  | 75 | 76 |
Revolving Loans |  | 2,398 | 2,995 |
Revolving Loans Converted to Term |  | 15 | 20 |
Total loans, net |  | 4,271 | 5,026 |
Gross charge-offs |  |  |  |
Year One |  | 75 |  |
Year Two |  | 23 |  |
Year Three |  | 18 |  |
Year Four |  | 14 |  |
Year Five |  | 14 |  |
Prior |  | 8 |  |
Revolving Loans |  | 11 |  |
Revolving Loans Converted to Term |  | 1 |  |
Total |  | 164 |  |
Other consumer | Using FICO Credit Metric |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 693 | 787 |
Year two |  | 476 | 377 |
Year three |  | 189 | 226 |
Year four |  | 91 | 214 |
Year five |  | 66 | 82 |
Prior |  | 41 | 47 |
Revolving Loans |  | 249 | 275 |
Revolving Loans Converted to Term |  | 5 | 8 |
Total loans, net |  | 1,810 | 2,016 |
Other consumer | FICO Score, Greater Than Or Equal To 780 | Using FICO Credit Metric |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 241 | 224 |
Year two |  | 127 | 97 |
Year three |  | 47 | 53 |
Year four |  | 21 | 46 |
Year five |  | 14 | 14 |
Prior |  | 11 | 18 |
Revolving Loans |  | 39 | 47 |
Revolving Loans Converted to Term |  | 1 | 2 |
Total loans, net |  | 501 | 501 |
Other consumer | FICO Score, 720 to 779 | Using FICO Credit Metric |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 286 | 302 |
Year two |  | 157 | 122 |
Year three |  | 54 | 68 |
Year four |  | 26 | 62 |
Year five |  | 17 | 20 |
Prior |  | 11 | 15 |
Revolving Loans |  | 80 | 89 |
Revolving Loans Converted to Term |  | 1 | 2 |
Total loans, net |  | 632 | 680 |
Other consumer | FICO Score, 660 to 719 | Using FICO Credit Metric |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 147 | 229 |
Year two |  | 140 | 110 |
Year three |  | 57 | 68 |
Year four |  | 27 | 66 |
Year five |  | 21 | 28 |
Prior |  | 11 | 8 |
Revolving Loans |  | 87 | 95 |
Revolving Loans Converted to Term |  | 2 | 2 |
Total loans, net |  | 492 | 606 |
Other consumer | FICO Score, Less Than 660 | Using FICO Credit Metric |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 19 | 32 |
Year two |  | 52 | 48 |
Year three |  | 31 | 37 |
Year four |  | 17 | 40 |
Year five |  | 14 | 20 |
Prior |  | 8 | 6 |
Revolving Loans |  | 43 | 44 |
Revolving Loans Converted to Term |  | 1 | 2 |
Total loans, net |  | 185 | 229 |
Other consumer | Other Internal Credit Metrics |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 19 | 125 |
Year two |  | 97 | 43 |
Year three |  | 33 | 40 |
Year four |  | 48 | 34 |
Year five |  | 71 | 7 |
Prior |  | 34 | 29 |
Revolving Loans |  | 2,149 | 2,720 |
Revolving Loans Converted to Term |  | 10 | 12 |
Total loans, net |  | $ 2,461 | $ 3,010 |
[1] | Our consolidated assets included the following for which we have elected the fair value option: Loans held for sale of $0.7 billion, Loans of $1.2 billion and Other assets of $0.1 billion at December 31, 2023. Comparable amounts at December 31, 2022 were $0.9 billion, $1.3 billion and $0.1 billion, respectively.

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