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Finance Receivables and Loans, Net - Schedule of Financing Receivable Credit Quality Indicators Commercial (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Financing Receivable, Credit Quality Indicator [Line Items]    
Total finance receivables and loans $ 143,673 $ 137,454
Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, originated, current fiscal year 1,827 3,683
Year two, originated, fiscal year before current fiscal year 3,705 2,148
Year three, originated, two years before current fiscal year 2,014 1,252
Year four, originated, three years before current fiscal year 1,208 1,982
Year five, originated, four years before current fiscal year 1,827 1,427
Originated, more than five years before current fiscal year 2,973 2,208
Revolving loans 25,596 23,356
Revolving loans converted to term 379 258
Total finance receivables and loans 39,529 36,314
Commercial | Consumer automotive    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, originated, current fiscal year 824 945
Year two, originated, fiscal year before current fiscal year 820 393
Year three, originated, two years before current fiscal year 350 272
Year four, originated, three years before current fiscal year 240 277
Year five, originated, four years before current fiscal year 251 113
Originated, more than five years before current fiscal year 156 91
Revolving loans 17,956 16,248
Revolving loans converted to term 0 0
Total finance receivables and loans 20,597 18,339
Commercial | Consumer automotive | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, originated, current fiscal year 819 942
Year two, originated, fiscal year before current fiscal year 818 391
Year three, originated, two years before current fiscal year 341 257
Year four, originated, three years before current fiscal year 227 266
Year five, originated, four years before current fiscal year 240 113
Originated, more than five years before current fiscal year 147 86
Revolving loans 16,204 14,861
Revolving loans converted to term 0 0
Total finance receivables and loans 18,796 16,916
Commercial | Consumer automotive | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, originated, current fiscal year 5 2
Year two, originated, fiscal year before current fiscal year 2 1
Year three, originated, two years before current fiscal year 9 15
Year four, originated, three years before current fiscal year 13 10
Year five, originated, four years before current fiscal year 10 0
Originated, more than five years before current fiscal year 9 5
Revolving loans 1,697 1,328
Revolving loans converted to term 0 0
Total finance receivables and loans 1,745 1,361
Commercial | Consumer automotive | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, originated, current fiscal year 0 1
Year two, originated, fiscal year before current fiscal year 0 1
Year three, originated, two years before current fiscal year 0 0
Year four, originated, three years before current fiscal year 0 1
Year five, originated, four years before current fiscal year 1 0
Originated, more than five years before current fiscal year 0 0
Revolving loans 55 59
Revolving loans converted to term 0 0
Total finance receivables and loans 56 62
Commercial | Other    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, originated, current fiscal year 319 757
Year two, originated, fiscal year before current fiscal year 755 641
Year three, originated, two years before current fiscal year 659 173
Year four, originated, three years before current fiscal year 201 542
Year five, originated, four years before current fiscal year 489 350
Originated, more than five years before current fiscal year 747 594
Revolving loans 7,576 7,053
Revolving loans converted to term 293 199
Total finance receivables and loans 11,039 10,309
Commercial | Other | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, originated, current fiscal year 319 757
Year two, originated, fiscal year before current fiscal year 613 594
Year three, originated, two years before current fiscal year 562 173
Year four, originated, three years before current fiscal year 201 306
Year five, originated, four years before current fiscal year 198 215
Originated, more than five years before current fiscal year 402 166
Revolving loans 7,148 6,647
Revolving loans converted to term 275 191
Total finance receivables and loans 9,718 9,049
Commercial | Other | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, originated, current fiscal year 0 0
Year two, originated, fiscal year before current fiscal year 142 47
Year three, originated, two years before current fiscal year 97 0
Year four, originated, three years before current fiscal year 0 236
Year five, originated, four years before current fiscal year 291 115
Originated, more than five years before current fiscal year 182 260
Revolving loans 344 347
Revolving loans converted to term 18 8
Total finance receivables and loans 1,074 1,013
Commercial | Other | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, originated, current fiscal year 0 0
Year two, originated, fiscal year before current fiscal year 0 0
Year three, originated, two years before current fiscal year 0 0
Year four, originated, three years before current fiscal year 0 0
Year five, originated, four years before current fiscal year 0 20
Originated, more than five years before current fiscal year 125 61
Revolving loans 82 42
Revolving loans converted to term 0 0
Total finance receivables and loans 207 123
Commercial | Other | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, originated, current fiscal year 0 0
Year two, originated, fiscal year before current fiscal year 0 0
Year three, originated, two years before current fiscal year 0 0
Year four, originated, three years before current fiscal year 0 0
Year five, originated, four years before current fiscal year 0 0
Originated, more than five years before current fiscal year 38 107
Revolving loans 2 17
Revolving loans converted to term 0 0
Total finance receivables and loans 40 124
Commercial | Commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, originated, current fiscal year 684 1,981
Year two, originated, fiscal year before current fiscal year 2,130 1,114
Year three, originated, two years before current fiscal year 1,005 807
Year four, originated, three years before current fiscal year 767 1,163
Year five, originated, four years before current fiscal year 1,087 964
Originated, more than five years before current fiscal year 2,070 1,523
Revolving loans 64 55
Revolving loans converted to term 86 59
Total finance receivables and loans 7,893 7,666
Commercial | Commercial real estate | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, originated, current fiscal year 678 1,981
Year two, originated, fiscal year before current fiscal year 2,109 1,069
Year three, originated, two years before current fiscal year 919 759
Year four, originated, three years before current fiscal year 732 1,080
Year five, originated, four years before current fiscal year 1,007 919
Originated, more than five years before current fiscal year 1,956 1,461
Revolving loans 64 55
Revolving loans converted to term 86 59
Total finance receivables and loans 7,551 7,383
Commercial | Commercial real estate | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, originated, current fiscal year 6 0
Year two, originated, fiscal year before current fiscal year 21 45
Year three, originated, two years before current fiscal year 86 44
Year four, originated, three years before current fiscal year 31 67
Year five, originated, four years before current fiscal year 65 45
Originated, more than five years before current fiscal year 114 61
Revolving loans 0 0
Revolving loans converted to term 0 0
Total finance receivables and loans 323 262
Commercial | Commercial real estate | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, originated, current fiscal year 0 0
Year two, originated, fiscal year before current fiscal year 0 0
Year three, originated, two years before current fiscal year 0 2
Year four, originated, three years before current fiscal year 2 15
Year five, originated, four years before current fiscal year 15 0
Originated, more than five years before current fiscal year 0 1
Revolving loans 0 0
Revolving loans converted to term 0 0
Total finance receivables and loans 17 18
Commercial | Commercial real estate | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, originated, current fiscal year 0 0
Year two, originated, fiscal year before current fiscal year 0 0
Year three, originated, two years before current fiscal year 0 2
Year four, originated, three years before current fiscal year 2 1
Year five, originated, four years before current fiscal year 0 0
Originated, more than five years before current fiscal year 0 0
Revolving loans 0 0
Revolving loans converted to term 0 0
Total finance receivables and loans $ 2 $ 3