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GM Financial Receivables and Transactions Summary of Finance Receivables (Details) - GM Financial [Member] - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
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Finance Receivables [Line Items] |  |  |  |
Finance receivables, collectively evaluated for impairment, net of fees | $ 51,235 | $ 50,455 |  |
Finance receivables, individually evaluated for impairment, net of fees(b) | 2,367 | 2,389 |  |
GM Financial receivables | 53,602 | 52,844 |  |
Less: allowance for loan losses(b) | (924) | (911) | $ (912) | $ (942)
GM Financial receivables, net | 52,678 | 51,933 |  |
Specific allowance | 326 | 325 |  |
Retail Finance Receivables [Member] |  |  |  |
Finance Receivables [Line Items] |  |  |  |
Finance receivables, collectively evaluated for impairment, net of fees | 39,331 | 38,220 |  |
Finance receivables, individually evaluated for impairment, net of fees(b) | 2,333 | 2,348 |  |
GM Financial receivables | 41,664 | 40,568 |  |
Less: allowance for loan losses(b) | (862) | (844) |  |
GM Financial receivables, net | 40,802 | 39,724 |  |
Specific allowance | 324 | 321 |  |
Commercial Finance Receivables [Member] |  |  |  |
Finance Receivables [Line Items] |  |  |  |
Finance receivables, collectively evaluated for impairment, net of fees | 11,904 | 12,235 |  |
Finance receivables, individually evaluated for impairment, net of fees(b) | 34 | 41 |  |
GM Financial receivables | 11,938 | 12,276 |  |
Less: allowance for loan losses(b) | (62) | (67) |  |
GM Financial receivables, net | 11,876 | 12,209 |  |
Dealer cash management balance | 1,100 | 922 |  |
Level 2 [Member] |  |  |  |
Finance Receivables [Line Items] |  |  |  |
Fair value of GM Financial receivables | 11,876 | 12,209 |  |
Level 3 [Member] |  |  |  |
Finance Receivables [Line Items] |  |  |  |
Fair value of GM Financial receivables | $ 40,830 | $ 39,430 |  |

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