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Finance Receivables and Loans, Net - Schedule of Financing Receivable Gross Charge-Offs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, originated, current fiscal year, writeoff     $ 19   $ 168
Year two, originated, fiscal year before current fiscal year, writeoff     326   564
Year three, originated, two years before current fiscal year, writeoff     302   747
Year four, originated, three years before current fiscal year, writeoff     290   661
Year five, originated, four years before current fiscal year, writeoff     229   320
More than five years before current fiscal year, writeoff     191   154
Revolving loans     0   65
Revolving loans converted to term     0   4
Total $ 685 $ 602 1,357 $ 1,347 2,683
Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, originated, current fiscal year, writeoff     19   168
Year two, originated, fiscal year before current fiscal year, writeoff     326   564
Year three, originated, two years before current fiscal year, writeoff     302   747
Year four, originated, three years before current fiscal year, writeoff     290   661
Year five, originated, four years before current fiscal year, writeoff     229   319
More than five years before current fiscal year, writeoff     139   154
Revolving loans     0   64
Revolving loans converted to term     0   4
Total     1,305   2,681
Consumer | Consumer automotive          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, originated, current fiscal year, writeoff     19   168
Year two, originated, fiscal year before current fiscal year, writeoff     326   564
Year three, originated, two years before current fiscal year, writeoff     302   747
Year four, originated, three years before current fiscal year, writeoff     290   660
Year five, originated, four years before current fiscal year, writeoff     229   318
More than five years before current fiscal year, writeoff     139   153
Revolving loans     0   0
Revolving loans converted to term     0   0
Total 634 599 1,305 1,275 2,610
Consumer | Consumer mortgage          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, originated, current fiscal year, writeoff         0
Year two, originated, fiscal year before current fiscal year, writeoff         0
Year three, originated, two years before current fiscal year, writeoff         0
Year four, originated, three years before current fiscal year, writeoff         1
Year five, originated, four years before current fiscal year, writeoff         1
More than five years before current fiscal year, writeoff         1
Revolving loans         0
Revolving loans converted to term         0
Total 0 2 0 2 3
Write-downs from transfers to held-for-sale         5
Consumer | Other          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, originated, current fiscal year, writeoff         0
Year two, originated, fiscal year before current fiscal year, writeoff         0
Year three, originated, two years before current fiscal year, writeoff         0
Year four, originated, three years before current fiscal year, writeoff         0
Year five, originated, four years before current fiscal year, writeoff         0
More than five years before current fiscal year, writeoff         0
Revolving loans         64
Revolving loans converted to term         4
Total       68 68
Commercial          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, originated, current fiscal year, writeoff     0   0
Year two, originated, fiscal year before current fiscal year, writeoff     0   0
Year three, originated, two years before current fiscal year, writeoff     0   0
Year four, originated, three years before current fiscal year, writeoff     0   0
Year five, originated, four years before current fiscal year, writeoff     0   1
More than five years before current fiscal year, writeoff     52   0
Revolving loans     0   1
Revolving loans converted to term     0   0
Total $ 51 $ 1 52 $ 2 2
Commercial | Consumer automotive          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, originated, current fiscal year, writeoff         0
Year two, originated, fiscal year before current fiscal year, writeoff         0
Year three, originated, two years before current fiscal year, writeoff         0
Year four, originated, three years before current fiscal year, writeoff         0
Year five, originated, four years before current fiscal year, writeoff         1
More than five years before current fiscal year, writeoff         0
Revolving loans         1
Revolving loans converted to term         0
Total         $ 2
Commercial | Other          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, originated, current fiscal year, writeoff     0    
Year two, originated, fiscal year before current fiscal year, writeoff     0    
Year three, originated, two years before current fiscal year, writeoff     0    
Year four, originated, three years before current fiscal year, writeoff     0    
Year five, originated, four years before current fiscal year, writeoff     0    
More than five years before current fiscal year, writeoff     52    
Revolving loans     0    
Revolving loans converted to term     0    
Total     $ 52