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GM Financial Receivables and Transactions - Summary of Finance Receivables (Details) - GM Financial [Member] - USD ($) $ in Millions | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
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Finance Receivables [Line Items] |  |  |  |  |  |
Finance receivables, collectively evaluated for impairment, net of fees | $ 52,263 |  | $ 50,455 |  |  |
Finance receivables, individually evaluated for impairment, net of fees | 2,430 |  | 2,389 |  |  |
GM Financial receivables | 54,693 |  | 52,844 |  |  |
Less: allowance for loan losses | (933) | $ (957) | (911) | $ (900) | $ (873) | $ (942)
GM Financial receivables, net | 53,760 |  | 51,933 |  |  |
Specific allowance | 348 |  | 325 |  |  |
Retail Finance Receivables [Member] |  |  |  |  |  |
Finance Receivables [Line Items] |  |  |  |  |  |
Finance receivables, collectively evaluated for impairment, net of fees | 39,507 |  | 38,220 |  |  |
Finance receivables, individually evaluated for impairment, net of fees | 2,390 |  | 2,348 |  |  |
GM Financial receivables | 41,897 |  | 40,568 |  |  |
Less: allowance for loan losses | (856) |  | (844) |  |  |
GM Financial receivables, net | 41,041 |  | 39,724 |  |  |
Specific allowance | 337 |  | 321 |  |  |
Commercial Finance Receivables [Member] |  |  |  |  |  |
Finance Receivables [Line Items] |  |  |  |  |  |
Finance receivables, collectively evaluated for impairment, net of fees | 12,756 |  | 12,235 |  |  |
Finance receivables, individually evaluated for impairment, net of fees | 40 |  | 41 |  |  |
GM Financial receivables | 12,796 |  | 12,276 |  |  |
Less: allowance for loan losses | (77) |  | (67) |  |  |
GM Financial receivables, net | 12,719 |  | 12,209 |  |  |
Dealer cash management balance | 1,200 |  | 922 |  |  |
Level 2 [Member] |  |  |  |  |  |
Finance Receivables [Line Items] |  |  |  |  |  |
Fair value of GM Financial receivables | 12,719 |  | 12,209 |  |  |
Level 3 [Member] |  |  |  |  |  |
Finance Receivables [Line Items] |  |  |  |  |  |
Fair value of GM Financial receivables | $ 41,557 |  | $ 39,430 |  |  |

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