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GM Financial Receivables and Transactions - Summary of Finance Receivables (Details) - GM Financial - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Finance Receivables [Line Items] |  |  |  |
Finance receivables, collectively evaluated for impairment, net of fees | $ 51,446 | $ 50,455 |  |
Finance receivables, individually evaluated for impairment, net of fees | 2,454 | 2,389 |  |
GM Financial receivables | 53,900 | 52,844 |  |
Less: allowance for loan losses | (944) | (911) | $ (942) | $ (805)
GM Financial receivables, net | 52,956 | 51,933 |  |
Specific allowance | 348 | 325 | $ 331 |
Commercial Finance Receivables |  |  |  |
Finance Receivables [Line Items] |  |  |  |
Finance receivables, collectively evaluated for impairment, net of fees | 11,595 | 12,235 |  |
Finance receivables, individually evaluated for impairment, net of fees | 76 | 41 |  |
GM Financial receivables | 11,671 | 12,276 |  |
Less: allowance for loan losses | (78) | (67) |  |
GM Financial receivables, net | 11,593 | 12,209 |  |
Dealer cash management balances | 1,200 | 922 |  |
Retail Finance Receivables |  |  |  |
Finance Receivables [Line Items] |  |  |  |
Finance receivables, collectively evaluated for impairment, net of fees | 39,851 | 38,220 |  |
Finance receivables, individually evaluated for impairment, net of fees | 2,378 | 2,348 |  |
GM Financial receivables | 42,229 | 40,568 |  |
Less: allowance for loan losses | (866) | (844) |  |
GM Financial receivables, net | 41,363 | 39,724 |  |
Specific allowance | 330 | 321 |  |
Level 2 |  |  |  |
Finance Receivables [Line Items] |  |  |  |
Fair value of GM Financial receivables | 11,593 | 12,209 |  |
Level 3 |  |  |  |
Finance Receivables [Line Items] |  |  |  |
Fair value of GM Financial receivables | $ 41,973 | $ 39,430 |  |

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