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Finance Receivables and Loans, Net - Schedule of Past Due Financing Receivables and Loans Commercial (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | $ 133,485 | $ 136,030
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 32,654 | 32,745
Automotive | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 16,939 | 18,259
Other | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 8,984 | 8,212
Commercial real estate | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 6,731 | 6,274
Total past due | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 3 | 42
Total past due | Automotive | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 2 | 5
Total past due | Other | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 0 | 35
Total past due | Commercial real estate | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 1 | 2
30–59 days past due | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 0 | 41
30–59 days past due | Automotive | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 0 | 5
30–59 days past due | Other | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 0 | 35
30–59 days past due | Commercial real estate | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 0 | 1
60–89 days past due | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 0 | 0
60–89 days past due | Automotive | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 0 | 0
60–89 days past due | Other | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 0 | 0
60–89 days past due | Commercial real estate | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 0 | 0
90 or more days past due | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 3 | 1
90 or more days past due | Automotive | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 2 | 0
90 or more days past due | Other | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 0 | 0
90 or more days past due | Commercial real estate | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 1 | 1
Current | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 32,651 | 32,703
Current | Automotive | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 16,937 | 18,254
Current | Other | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 8,984 | 8,177
Current | Commercial real estate | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | $ 6,730 | $ 6,272

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