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GM Financial Receivables and Transactions - Retail Finance Receivables Delinquencies and TDRs (Details) - GM Financial [Member] $ in Millions | Sep. 30, 2019 USD ($) score | Dec. 31, 2018 USD ($) score
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Delinquent Contracts [Abstract] |  |
Finance receivables, individually evaluated for impairment, net of fees | $ 2,430 | $ 2,389
Allowance for loan losses - TDRs | $ 348 | $ 325
Retail Finance Receivables [Member] |  |
Financing Receivable, Recorded Investment, Additional Information [Abstract] |  |
Percentage of receivables with sub-prime credit scores | 24.00% | 25.00%
Sub-prime FICO score | score | 620 | 620
Retail finance receivables, nonaccrual status | $ 853 | $ 888
Delinquent Contracts [Abstract] |  |
Past Due Amount | $ 1,814 | $ 1,853
Percent of Contractual Amount Due | 4.30% | 4.90%
Finance receivables, individually evaluated for impairment, net of fees | $ 2,390 | $ 2,348
Allowance for loan losses - TDRs | 337 | 321
31-to-60 days delinquent [Member] | Retail Finance Receivables [Member] |  |
Delinquent Contracts [Abstract] |  |
Past Due Amount | $ 1,252 | $ 1,302
Percent of Contractual Amount Due | 3.00% | 3.50%
Greater-than-60 days delinquent [Member] | Retail Finance Receivables [Member] |  |
Delinquent Contracts [Abstract] |  |
Past Due Amount | $ 514 | $ 498
Percent of Contractual Amount Due | 1.20% | 1.30%
Total finance receivables more than 30 days delinquent [Member] | Retail Finance Receivables [Member] |  |
Delinquent Contracts [Abstract] |  |
Past Due Amount | $ 1,766 | $ 1,800
Percent of Contractual Amount Due | 4.20% | 4.80%
In repossession [Member] | Retail Finance Receivables [Member] |  |
Delinquent Contracts [Abstract] |  |
Past Due Amount | $ 48 | $ 53
Percent of Contractual Amount Due | 0.10% | 0.10%

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