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Finance Receivables and Loans, Net (Past Due Financing Receivables and Loans Commercial) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | $ 137,960 | $ 139,439
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 34,151 | 34,462
Automotive | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 19,163 | 18,700
Other | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 8,911 | 9,712
Commercial real estate | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 6,077 | 6,050
Total past due | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 4 | 5
Total past due | Automotive | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 4 | 0
Total past due | Other | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 0 | 5
Total past due | Commercial real estate | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 0 | 0
30–59 days past due | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 4 | 2
30–59 days past due | Automotive | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 4 | 0
30–59 days past due | Other | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 0 | 2
30–59 days past due | Commercial real estate | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 0 | 0
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 | 0 | 3
90 or more days past due | Automotive | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 0 | 0
90 or more days past due | Other | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 0 | 3
90 or more days past due | Commercial real estate | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 0 | 0
Current | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 34,147 | 34,457
Current | Automotive | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 19,159 | 18,700
Current | Other | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | 8,911 | 9,707
Current | Commercial real estate | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Finance receivables and loans, net | $ 6,077 | $ 6,050

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