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Finance Receivables and Loans, Net - Schedule of Financing Receivable Gross Charge-Offs (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Financing Receivable, Credit Quality Indicator [Line Items]      
Year one, originated, current fiscal year, writeoff $ 1   $ 168
Year two, originated, fiscal year before current fiscal year, writeoff 147   564
Year three, originated, two years before current fiscal year, writeoff 162   747
Year four, originated, three years before current fiscal year, writeoff 158   661
Year five, originated, four years before current fiscal year, writeoff 125   320
More than five years before current fiscal year, writeoff 79   154
Revolving loans 0   65
Revolving loans converted to term 0   4
Total 672 $ 745 2,683
Consumer      
Financing Receivable, Credit Quality Indicator [Line Items]      
Year one, originated, current fiscal year, writeoff 1   168
Year two, originated, fiscal year before current fiscal year, writeoff 147   564
Year three, originated, two years before current fiscal year, writeoff 162   747
Year four, originated, three years before current fiscal year, writeoff 158   661
Year five, originated, four years before current fiscal year, writeoff 125   319
More than five years before current fiscal year, writeoff 78   154
Revolving loans 0   64
Revolving loans converted to term 0   4
Total 671   2,681
Consumer | Consumer automotive      
Financing Receivable, Credit Quality Indicator [Line Items]      
Year one, originated, current fiscal year, writeoff 1   168
Year two, originated, fiscal year before current fiscal year, writeoff 147   564
Year three, originated, two years before current fiscal year, writeoff 162   747
Year four, originated, three years before current fiscal year, writeoff 158   660
Year five, originated, four years before current fiscal year, writeoff 125   318
More than five years before current fiscal year, writeoff 78   153
Revolving loans 0   0
Revolving loans converted to term 0   0
Total 671 676 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 0 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 1   0
Revolving loans 0   1
Revolving loans converted to term 0   0
Total 1 $ 1 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 1    
Revolving loans 0    
Revolving loans converted to term 0    
Total $ 1