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Finance Receivables and Loans, Net - Schedule of Financing Receivable Credit Quality Indicators Commercial (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Financing Receivable, Credit Quality Indicator [Line Items]    
Total finance receivables and loans $ 139,890 $ 137,454
Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, originated, current fiscal year 1,282 3,683
Year two, originated, fiscal year before current fiscal year 3,782 2,148
Year three, originated, two years before current fiscal year 2,051 1,252
Year four, originated, three years before current fiscal year 1,244 1,982
Year five, originated, four years before current fiscal year 1,873 1,427
Originated, more than five years before current fiscal year 3,353 2,208
Revolving loans 24,029 23,356
Revolving loans converted to term 303 258
Total finance receivables and loans 37,917 36,314
Commercial | Consumer automotive    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, originated, current fiscal year 630 945
Year two, originated, fiscal year before current fiscal year 928 393
Year three, originated, two years before current fiscal year 341 272
Year four, originated, three years before current fiscal year 258 277
Year five, originated, four years before current fiscal year 264 113
Originated, more than five years before current fiscal year 172 91
Revolving loans 16,379 16,248
Revolving loans converted to term 0 0
Total finance receivables and loans 18,972 18,339
Commercial | Consumer automotive | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, originated, current fiscal year 630 942
Year two, originated, fiscal year before current fiscal year 923 391
Year three, originated, two years before current fiscal year 340 257
Year four, originated, three years before current fiscal year 243 266
Year five, originated, four years before current fiscal year 254 113
Originated, more than five years before current fiscal year 167 86
Revolving loans 14,816 14,861
Revolving loans converted to term 0 0
Total finance receivables and loans 17,373 16,916
Commercial | Consumer automotive | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, originated, current fiscal year 0 2
Year two, originated, fiscal year before current fiscal year 5 1
Year three, originated, two years before current fiscal year 0 15
Year four, originated, three years before current fiscal year 15 10
Year five, originated, four years before current fiscal year 9 0
Originated, more than five years before current fiscal year 5 5
Revolving loans 1,509 1,328
Revolving loans converted to term 0 0
Total finance receivables and loans 1,543 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 1 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 54 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 256 757
Year two, originated, fiscal year before current fiscal year 753 641
Year three, originated, two years before current fiscal year 667 173
Year four, originated, three years before current fiscal year 193 542
Year five, originated, four years before current fiscal year 497 350
Originated, more than five years before current fiscal year 909 594
Revolving loans 7,584 7,053
Revolving loans converted to term 234 199
Total finance receivables and loans 11,093 10,309
Commercial | Other | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, originated, current fiscal year 256 757
Year two, originated, fiscal year before current fiscal year 684 594
Year three, originated, two years before current fiscal year 596 173
Year four, originated, three years before current fiscal year 193 306
Year five, originated, four years before current fiscal year 235 215
Originated, more than five years before current fiscal year 368 166
Revolving loans 7,124 6,647
Revolving loans converted to term 228 191
Total finance receivables and loans 9,684 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 69 47
Year three, originated, two years before current fiscal year 71 0
Year four, originated, three years before current fiscal year 0 236
Year five, originated, four years before current fiscal year 262 115
Originated, more than five years before current fiscal year 368 260
Revolving loans 390 347
Revolving loans converted to term 6 8
Total finance receivables and loans 1,166 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 80 61
Revolving loans 51 42
Revolving loans converted to term 0 0
Total finance receivables and loans 131 123
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 93 107
Revolving loans 19 17
Revolving loans converted to term 0 0
Total finance receivables and loans 112 124
Commercial | Commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, originated, current fiscal year 396 1,981
Year two, originated, fiscal year before current fiscal year 2,101 1,114
Year three, originated, two years before current fiscal year 1,043 807
Year four, originated, three years before current fiscal year 793 1,163
Year five, originated, four years before current fiscal year 1,112 964
Originated, more than five years before current fiscal year 2,272 1,523
Revolving loans 66 55
Revolving loans converted to term 69 59
Total finance receivables and loans 7,852 7,666
Commercial | Commercial real estate | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, originated, current fiscal year 389 1,981
Year two, originated, fiscal year before current fiscal year 2,079 1,069
Year three, originated, two years before current fiscal year 998 759
Year four, originated, three years before current fiscal year 754 1,080
Year five, originated, four years before current fiscal year 1,032 919
Originated, more than five years before current fiscal year 2,166 1,461
Revolving loans 66 55
Revolving loans converted to term 69 59
Total finance receivables and loans 7,553 7,383
Commercial | Commercial real estate | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, originated, current fiscal year 7 0
Year two, originated, fiscal year before current fiscal year 22 45
Year three, originated, two years before current fiscal year 45 44
Year four, originated, three years before current fiscal year 35 67
Year five, originated, four years before current fiscal year 65 45
Originated, more than five years before current fiscal year 105 61
Revolving loans 0 0
Revolving loans converted to term 0 0
Total finance receivables and loans 279 262
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 1 1
Revolving loans 0 0
Revolving loans converted to term 0 0
Total finance receivables and loans 18 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