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GM Financial Receivables and Transactions - Commercial Finance Receivables Credit Quality Indicators (Details) - GM Financial [Member] - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Financing Receivable, Credit Quality Indicator [Line Items] |  |
GM Financial receivables | $ 55,146 | $ 52,844
Commercial Finance Receivables [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
GM Financial receivables | 12,555 | 12,276
Commercial Finance Receivables [Member] | Group I - Dealers with superior financial metrics [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
GM Financial receivables | 1,922 | 2,192
Commercial Finance Receivables [Member] | Group II - Dealers with strong financial metrics [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
GM Financial receivables | 5,102 | 4,399
Commercial Finance Receivables [Member] | Group III - Dealers with fair financial metrics [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
GM Financial receivables | 3,861 | 4,064
Commercial Finance Receivables [Member] | Group IV - Dealers with weak financial metrics [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
GM Financial receivables | 1,141 | 1,116
Commercial Finance Receivables [Member] | Group V - Dealers warranting special mention due to potential weaknesses [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
GM Financial receivables | 419 | 422
Commercial Finance Receivables [Member] | Group VI - Dealers with loans classified as substandard, doubtful or impaired [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
GM Financial receivables | $ 110 | $ 83

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- Definition Amount, before allowance for credit loss, of financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919230-210447 + Details
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