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Derivative Financial Instruments (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Automotive [Member] | Not Designated as Hedges [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | $ 3,451 | $ 3,488
Automotive [Member] | Not Designated as Hedges [Member] | Foreign Currency [Member] | Fair Value Level 2 [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 2,984 | 2,834
Notional amount, derivative liability | 2,102 | 1,188
Automotive [Member] | Not Designated as Hedges [Member] | Commodity [Member] | Fair Value Level 2 [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 418 | 606
Automotive [Member] | Not Designated as Hedges [Member] | PSA Warrants [Member] | Fair Value Level 2 [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 49 | 48
Automotive [Member] | Not Designated as Hedges [Member] | Fair Value Hedges [Member] | Fair Value Level 2 [Member] | PSA Group [Member] |  |
Derivative [Line Items] |  |
Fair value of derivative assets | 909 | 764
GM Financial [Member] | Designated as Hedges [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 4,040 | 5,001
Notional amount, derivative liability | 9,762 | 9,860
GM Financial [Member] | Designated as Hedges [Member] | Cash Flow Hedges [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 3,207 | 3,751
GM Financial [Member] | Designated as Hedges [Member] | Cash Flow Hedges [Member] | Interest Rate Contract [Member] | Fair Value Level 2 [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 1,794 | 2,177
GM Financial [Member] | Designated as Hedges [Member] | Cash Flow Hedges [Member] | Foreign Currency [Member] | Fair Value Level 2 [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 1,413 | 1,574
Notional amount, derivative liability | 815 | 0
GM Financial [Member] | Designated as Hedges [Member] | Fair Value Hedges [Member] | Interest Rate Contract [Member] | Fair Value Level 2 [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 833 | 1,250
Notional amount, derivative liability | 8,947 | 9,860
Fair value of derivative liabilities | 396 | 290
GM Financial [Member] | Not Designated as Hedges [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 52,540 | 56,782
Notional amount, derivative liability | 40,634 | 26,357
GM Financial [Member] | Not Designated as Hedges [Member] | Interest Rate Contract [Member] | Fair Value Level 2 [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 51,310 | 55,581
Notional amount, derivative liability | 39,896 | 26,357
Fair value of derivative assets | 464 | 329
GM Financial [Member] | Not Designated as Hedges [Member] | Foreign Currency [Member] | Fair Value Level 2 [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 1,230 | 1,201
Notional amount, derivative liability | 738 | 0
GM Financial [Member] | Not Designated as Hedges [Member] | Fair Value Hedges [Member] | Interest Rate Contract [Member] | Fair Value Level 2 [Member] |  |
Derivative [Line Items] |  |
Fair value of derivative liabilities | $ 514 | $ 207

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