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GM Financial Receivables Retail Finance Receivables Delinquencies (Details) - GM Financial [Member] $ in Millions | Dec. 31, 2017 USD ($) score | Dec. 31, 2016 USD ($) score | Dec. 31, 2015 USD ($)
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Delinquent Contracts includes Repossessions [Abstract] |  |  |
Finance receivables, individually evaluated for impairment, net of fees | $ 2,250 | $ 1,947 |
Allowance for loan losses - TDRs | $ 331 | $ 280 | $ 225
Retail Finance Receivables [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Percentage of Sub-prime Loans | 33.00% | 41.00% |
Sub-prime FICO Score | score | 620 | 620 |
Retail finance receivables, nonaccrual status | $ 778 | $ 798 |
Delinquent Contracts includes Repossessions [Abstract] |  |  |
Amount | $ 1,920 | $ 1,799 |
Percent of Contractual Amount Due | 5.80% | 6.80% |
Finance receivables, individually evaluated for impairment, net of fees | $ 2,228 | $ 1,920 |
Allowance for loan losses - TDRs | 328 | 276 |
31 to 60 Days Delinquent [Member] | Retail Finance Receivables [Member] |  |  |
Delinquent Contracts includes Repossessions [Abstract] |  |  |
Amount | $ 1,334 | $ 1,220 |
Percent of Contractual Amount Due | 4.10% | 4.60% |
Greater than 60 Days Delinquent [Member] | Retail Finance Receivables [Member] |  |  |
Delinquent Contracts includes Repossessions [Abstract] |  |  |
Amount | $ 559 | $ 532 |
Percent of Contractual Amount Due | 1.70% | 2.00% |
Total finance receivables more than 30 Days Delinquent [Member] | Retail Finance Receivables [Member] |  |  |
Delinquent Contracts includes Repossessions [Abstract] |  |  |
Amount | $ 1,893 | $ 1,752 |
Percent of Contractual Amount Due | 5.80% | 6.60% |
In Repossession [Member] | Retail Finance Receivables [Member] |  |  |
Delinquent Contracts includes Repossessions [Abstract] |  |  |
Amount | $ 27 | $ 47 |
Percent of Contractual Amount Due | 0.00% | 0.20% |

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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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