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GM Financial Receivables and Transactions Retail Finance Receivables Delinquencies and TDRs (Details) - GM Financial [Member] $ in Millions | Jun. 30, 2018 USD ($) score | Dec. 31, 2017 USD ($) score | Jun. 30, 2017 USD ($)
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Delinquent Contracts [Abstract] |  |  |
Finance receivables, individually evaluated for impairment, net of fees | $ 2,323 | $ 2,250 |
Allowance for loan losses - TDRs | $ 313 | $ 331 |
Retail Finance Receivables [Member] |  |  |
Financing Receivable, Recorded Investment, Additional Information [Abstract] |  |  |
Percentage of receivables with sub-prime credit scores | 29.00% | 33.00% |
Sub-prime FICO score | score | 620 | 620 |
Retail finance receivables, nonaccrual status | $ 822 | $ 778 |
Delinquent Contracts [Abstract] |  |  |
Past Due Amount | $ 1,697 |  | $ 1,583
Percent of Contractual Amount Due | 4.80% |  | 5.10%
Finance receivables, individually evaluated for impairment, net of fees | $ 2,277 | 2,228 |
Allowance for loan losses - TDRs | 307 | $ 328 |
31-to-60 days delinquent [Member] | Retail Finance Receivables [Member] |  |  |
Delinquent Contracts [Abstract] |  |  |
Past Due Amount | $ 1,178 |  | $ 1,076
Percent of Contractual Amount Due | 3.30% |  | 3.40%
Greater-than-60 days delinquent [Member] | Retail Finance Receivables [Member] |  |  |
Delinquent Contracts [Abstract] |  |  |
Past Due Amount | $ 462 |  | $ 464
Percent of Contractual Amount Due | 1.30% |  | 1.50%
Total finance receivables more than 30 days delinquent [Member] | Retail Finance Receivables [Member] |  |  |
Delinquent Contracts [Abstract] |  |  |
Past Due Amount | $ 1,640 |  | $ 1,540
Percent of Contractual Amount Due | 4.60% |  | 4.90%
In repossession [Member] | Retail Finance Receivables [Member] |  |  |
Delinquent Contracts [Abstract] |  |  |
Past Due Amount | $ 57 |  | $ 43
Percent of Contractual Amount Due | 0.20% |  | 0.20%

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- Definition Sub-prime loans as percentage of the total loans. + References No definition available. + Details
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- Definition The FICO score used to separate sub-prime from prime loans. The loans with a borrower that has less then this score will be considered as sub-prime. + References No definition available. + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524 + Details
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