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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
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.