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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Total loans, net | [1] | $ 316,467 | $ 321,508 |
Gross charge-offs |  |  |  |
Total |  | 1,435 | 1,092 | $ 985
Automobile |  |  |  |
Gross charge-offs |  |  |  |
Year One |  | 9 | 8 |
Year Two |  | 44 | 24 |
Year Three |  | 27 | 22 |
Year Four |  | 17 | 17 |
Year Five |  | 12 | 30 |
Prior |  | 22 | 20 |
Total |  | 131 | 121 |
Automobile | Using FICO Credit Metric |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 6,544 | 5,797 |
Year two |  | 3,862 | 3,630 |
Year three |  | 2,328 | 2,912 |
Year four |  | 1,681 | 1,174 |
Year five |  | 539 | 1,004 |
Prior |  | 401 | 343 |
Total loans, net |  | 15,355 | 14,860 |
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 |  | 3,288 | 2,722 |
Year two |  | 1,717 | 1,650 |
Year three |  | 1,094 | 1,483 |
Year four |  | 865 | 535 |
Year five |  | 241 | 368 |
Prior |  | 125 | 88 |
Total loans, net |  | 7,330 | 6,846 |
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 |  | 2,047 | 1,797 |
Year two |  | 1,123 | 1,104 |
Year three |  | 636 | 778 |
Year four |  | 415 | 301 |
Year five |  | 129 | 250 |
Prior |  | 90 | 80 |
Total loans, net |  | 4,440 | 4,310 |
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 |  | 963 | 1,014 |
Year two |  | 671 | 604 |
Year three |  | 367 | 408 |
Year four |  | 227 | 186 |
Year five |  | 82 | 186 |
Prior |  | 74 | 70 |
Total loans, net |  | 2,384 | 2,468 |
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 |  | 246 | 264 |
Year two |  | 351 | 272 |
Year three |  | 231 | 243 |
Year four |  | 174 | 152 |
Year five |  | 87 | 200 |
Prior |  | 112 | 105 |
Total loans, net |  | 1,201 | 1,236 |
Credit card |  |  |  |
Gross charge-offs |  |  |  |
Revolving Loans |  | 316 | 290 |
Revolving Loans Converted to Term |  | 39 | 29 |
Total |  | 355 | 319 |
Credit card | Using FICO Credit Metric |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Revolving Loans |  | 6,797 | 7,111 |
Revolving Loans Converted to Term |  | 82 | 69 |
Total loans, net |  | 6,879 | 7,180 |
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 |  | 2,090 | 2,017 |
Revolving Loans Converted to Term |  | 2 | 1 |
Total loans, net |  | 2,092 | 2,018 |
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 |  | 1,859 | 1,976 |
Revolving Loans Converted to Term |  | 5 | 4 |
Total loans, net |  | 1,864 | 1,980 |
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 |  | 1,815 | 1,979 |
Revolving Loans Converted to Term |  | 16 | 13 |
Total loans, net |  | 1,831 | 1,992 |
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 |  | 936 | 1,036 |
Revolving Loans Converted to Term |  | 57 | 48 |
Total loans, net |  | 993 | 1,084 |
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 |  | 97 | 103 |
Revolving Loans Converted to Term |  | 2 | 3 |
Total loans, net |  | 99 | 106 |
Education |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 70 | 106 |
Year two |  | 116 | 160 |
Year three |  | 139 | 83 |
Year four |  | 67 | 68 |
Year five |  | 53 | 85 |
Prior |  | 1,191 | 1,443 |
Total loans, net |  | 1,636 | 1,945 |
Gross charge-offs |  |  |  |
Year Three |  | 1 | 1 |
Year Four |  | 1 | 1 |
Year Five |  | 1 | 2 |
Prior |  | 16 | 13 |
Total |  | 19 | 17 |
Education | Using FICO Credit Metric |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 70 | 106 |
Year two |  | 116 | 160 |
Year three |  | 139 | 83 |
Year four |  | 67 | 68 |
Year five |  | 53 | 85 |
Prior |  | 500 | 538 |
Total loans, net |  | 945 | 1,040 |
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 |  | 22 | 35 |
Year two |  | 58 | 88 |
Year three |  | 79 | 45 |
Year four |  | 39 | 40 |
Year five |  | 33 | 51 |
Prior |  | 318 | 331 |
Total loans, net |  | 549 | 590 |
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 |  | 20 | 32 |
Year two |  | 36 | 47 |
Year three |  | 38 | 24 |
Year four |  | 20 | 19 |
Year five |  | 14 | 24 |
Prior |  | 116 | 131 |
Total loans, net |  | 244 | 277 |
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 |  | 13 | 20 |
Year two |  | 14 | 17 |
Year three |  | 15 | 8 |
Year four |  | 6 | 6 |
Year five |  | 5 | 8 |
Prior |  | 46 | 54 |
Total loans, net |  | 99 | 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 |  | 3 | 4 |
Year two |  | 3 | 3 |
Year three |  | 3 | 2 |
Year four |  | 1 | 1 |
Year five |  | 1 | 2 |
Prior |  | 19 | 21 |
Total loans, net |  | 30 | 33 |
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 |  | 12 | 15 |
Year two |  | 5 | 5 |
Year three |  | 4 | 4 |
Year four |  | 1 | 2 |
Year five |  |  |  |
Prior |  | 1 | 1 |
Total loans, net |  | 23 | 27 |
Education | Other Internal Credit Metrics |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Prior |  | 691 | 905 |
Total loans, net |  | 691 | 905 |
Other consumer |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 766 | 712 |
Year two |  | 409 | 573 |
Year three |  | 317 | 222 |
Year four |  | 90 | 139 |
Year five |  | 36 | 137 |
Prior |  | 113 | 75 |
Revolving Loans |  | 2,284 | 2,398 |
Revolving Loans Converted to Term |  | 12 | 15 |
Total loans, net |  | 4,027 | 4,271 |
Gross charge-offs |  |  |  |
Year One |  | 76 | 75 |
Year Two |  | 27 | 23 |
Year Three |  | 26 | 18 |
Year Four |  | 13 | 14 |
Year Five |  | 8 | 14 |
Prior |  | 9 | 8 |
Revolving Loans |  | 11 | 11 |
Revolving Loans Converted to Term |  | 1 | 1 |
Total |  | 171 | 164 |
Other consumer | Using FICO Credit Metric |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 760 | 693 |
Year two |  | 400 | 476 |
Year three |  | 240 | 189 |
Year four |  | 78 | 91 |
Year five |  | 25 | 66 |
Prior |  | 23 | 41 |
Revolving Loans |  | 228 | 249 |
Revolving Loans Converted to Term |  | 4 | 5 |
Total loans, net |  | 1,758 | 1,810 |
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 |  | 245 | 241 |
Year two |  | 129 | 127 |
Year three |  | 64 | 47 |
Year four |  | 20 | 21 |
Year five |  | 5 | 14 |
Prior |  | 6 | 11 |
Revolving Loans |  | 37 | 39 |
Revolving Loans Converted to Term |  | 1 | 1 |
Total loans, net |  | 507 | 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 |  | 292 | 286 |
Year two |  | 141 | 157 |
Year three |  | 70 | 54 |
Year four |  | 21 | 26 |
Year five |  | 6 | 17 |
Prior |  | 6 | 11 |
Revolving Loans |  | 72 | 80 |
Revolving Loans Converted to Term |  | 1 | 1 |
Total loans, net |  | 609 | 632 |
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 |  | 203 | 147 |
Year two |  | 97 | 140 |
Year three |  | 72 | 57 |
Year four |  | 22 | 27 |
Year five |  | 8 | 21 |
Prior |  | 6 | 11 |
Revolving Loans |  | 79 | 87 |
Revolving Loans Converted to Term |  | 1 | 2 |
Total loans, net |  | 488 | 492 |
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 |  | 20 | 19 |
Year two |  | 33 | 52 |
Year three |  | 34 | 31 |
Year four |  | 15 | 17 |
Year five |  | 6 | 14 |
Prior |  | 5 | 8 |
Revolving Loans |  | 40 | 43 |
Revolving Loans Converted to Term |  | 1 | 1 |
Total loans, net |  | 154 | 185 |
Other consumer | Other Internal Credit Metrics |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 6 | 19 |
Year two |  | 9 | 97 |
Year three |  | 77 | 33 |
Year four |  | 12 | 48 |
Year five |  | 11 | 71 |
Prior |  | 90 | 34 |
Revolving Loans |  | 2,056 | 2,149 |
Revolving Loans Converted to Term |  | 8 | 10 |
Total loans, net |  | $ 2,269 | $ 2,461 |
[1] | Our consolidated assets included the following for which we have elected the fair value option: Loans held for sale of $0.8 billion, Loans of $1.2 billion and Other assets of $0.1 billion at December 31, 2024. Comparable amounts at December 31, 2023 were $0.7 billion, $1.2 billion and $0.1 billion, respectively.

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