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Finance Receivables and Loans, Net (Past Due Financing Receivables and Loans Commercial) (Details) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2019 USD ($)
Financing Receivable, Past Due [Line Items] |  |  |
Finance receivables and loans, net | $ 118,234 | $ 128,231 | $ 129,210
Commercial portfolio segment |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing receivable, recorded investment, past due | 55 | 83 |
Financing receivable, recorded investment, current | 27,814 | 38,224 |
Finance receivables and loans, net | 27,869 | 38,307 | $ 38,512
Automotive loan | Commercial portfolio segment |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing receivable, recorded investment, past due | 49 | 62 |
Financing receivable, recorded investment, current | 17,706 | 28,270 |
Finance receivables and loans, net | 17,755 | 28,332 |
Other loan | Commercial portfolio segment |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing receivable, recorded investment, past due | 0 | 17 |
Financing receivable, recorded investment, current | 5,315 | 4,997 |
Finance receivables and loans, net | 5,315 | 5,014 |
Real estate-backed loan | Commercial portfolio segment |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing receivable, recorded investment, past due | 6 | 4 |
Financing receivable, recorded investment, current | 4,793 | 4,957 |
Finance receivables and loans, net | 4,799 | 4,961 |
Financing receivables, 30 to 59 days past due | Commercial portfolio segment |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing receivable, recorded investment, past due | 0 | 34 |
Financing receivables, 30 to 59 days past due | Automotive loan | Commercial portfolio segment |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing receivable, recorded investment, past due | 0 | 34 |
Financing receivables, 30 to 59 days past due | Other loan | Commercial portfolio segment |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing receivable, recorded investment, past due | 0 | 0 |
Financing receivables, 30 to 59 days past due | Real estate-backed loan | Commercial portfolio segment |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing receivable, recorded investment, past due | 0 | 0 |
Financing receivables, 60 to 89 days past due | Commercial portfolio segment |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing receivable, recorded investment, past due | 1 | 0 |
Financing receivables, 60 to 89 days past due | Automotive loan | Commercial portfolio segment |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing receivable, recorded investment, past due | 1 | 0 |
Financing receivables, 60 to 89 days past due | Other loan | Commercial portfolio segment |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing receivable, recorded investment, past due | 0 | 0 |
Financing receivables, 60 to 89 days past due | Real estate-backed loan | Commercial portfolio segment |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing receivable, recorded investment, past due | 0 | 0 |
Financing receivables, equal to greater than 90 days past due | Commercial portfolio segment |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing receivable, recorded investment, past due | 54 | 49 |
Financing receivables, equal to greater than 90 days past due | Automotive loan | Commercial portfolio segment |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing receivable, recorded investment, past due | 48 | 28 |
Financing receivables, equal to greater than 90 days past due | Other loan | Commercial portfolio segment |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing receivable, recorded investment, past due | 0 | 17 |
Financing receivables, equal to greater than 90 days past due | Real estate-backed loan | Commercial portfolio segment |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing receivable, recorded investment, past due | $ 6 | $ 4 |
Operating Segments | Automotive Finance operations | Commercial portfolio segment |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Commercial automotive customers enrolling in program | 2,290 |  |
Percent of customers enrolling in program | 73.00% |  |
Percentage of dealers who deferred wholesale interest and insurance payments | 39.00% |  |

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