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GM Financial Receivables and Transactions - Retail Finance Receivables Delinquencies and TDRs (Details) - GM Financial [Member] $ in Millions | Jun. 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 | $ 2,403 | $ 2,389
Allowance for loan losses - TDRs | $ 352 | $ 325
Retail Finance Receivables [Member] |  |
Financing Receivable, Recorded Investment, Additional Information [Abstract] |  |
Percentage of receivables with sub-prime credit scores | 23.00% | 25.00%
Sub-prime FICO score | score | 620 | 620
Retail finance receivables, nonaccrual status | $ 838 | $ 888
Delinquent Contracts [Abstract] |  |
Past Due Amount | $ 1,629 | $ 1,697
Percent of Contractual Amount Due | 3.80% | 4.80%
Finance receivables, individually evaluated for impairment, net of fees | $ 2,354 | $ 2,348
Allowance for loan losses - TDRs | 341 | 321
31-to-60 days delinquent [Member] | Retail Finance Receivables [Member] |  |
Delinquent Contracts [Abstract] |  |
Past Due Amount | $ 1,083 | $ 1,178
Percent of Contractual Amount Due | 2.50% | 3.30%
Greater-than-60 days delinquent [Member] | Retail Finance Receivables [Member] |  |
Delinquent Contracts [Abstract] |  |
Past Due Amount | $ 498 | $ 462
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 | $ 1,581 | $ 1,640
Percent of Contractual Amount Due | 3.70% | 4.60%
In repossession [Member] | Retail Finance Receivables [Member] |  |
Delinquent Contracts [Abstract] |  |
Past Due Amount | $ 48 | $ 57
Percent of Contractual Amount Due | 0.10% | 0.20%

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