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GM Financial Receivables and Transactions - Retail Finance Receivables Delinquencies (Details) - GM Financial $ in Millions | Dec. 31, 2019 USD ($) score | Dec. 31, 2018 USD ($) score | Dec. 31, 2017 USD ($)
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Delinquent Contracts includes Repossessions [Abstract] |  |  |
Finance receivables, individually evaluated for impairment, net of fees | $ 2,454 | $ 2,389 |
Allowance for loan losses | $ 348 | $ 325 | $ 331
Retail Finance Receivables |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Percentage of Sub-prime Loans | 24.00% | 25.00% |
Sub-prime FICO Score | score | 620 | 620 |
Retail finance receivables, nonaccrual status | $ 875 | $ 888 |
Delinquent Contracts includes Repossessions [Abstract] |  |  |
Amount | $ 1,940 | $ 1,940 |
Percent of Contractual Amount Due | 4.60% | 4.80% |
Finance receivables, individually evaluated for impairment, net of fees | $ 2,378 | $ 2,348 |
Allowance for loan losses | 330 | 321 |
31 to 60 Days Delinquent | Retail Finance Receivables |  |  |
Delinquent Contracts includes Repossessions [Abstract] |  |  |
Amount | $ 1,354 | $ 1,349 |
Percent of Contractual Amount Due | 3.20% | 3.30% |
Greater than 60 Days Delinquent | Retail Finance Receivables |  |  |
Delinquent Contracts includes Repossessions [Abstract] |  |  |
Amount | $ 542 | $ 547 |
Percent of Contractual Amount Due | 1.30% | 1.40% |
Total finance receivables more than 30 Days Delinquent | Retail Finance Receivables |  |  |
Delinquent Contracts includes Repossessions [Abstract] |  |  |
Amount | $ 1,896 | $ 1,896 |
Percent of Contractual Amount Due | 4.50% | 4.70% |
In Repossession | Retail Finance Receivables |  |  |
Delinquent Contracts includes Repossessions [Abstract] |  |  |
Amount | $ 44 | $ 44 |
Percent of Contractual Amount Due | 0.10% | 0.10% |

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