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Derivative Financial Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Automotive [Member] | Designated as Hedges [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | $ 0 | $ 909
Automotive [Member] | Designated as Hedges [Member] | Cash Flow Hedges [Member] | Foreign Currency [Member] | Fair Value Level 2 [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 0 | 803
Automotive [Member] | Designated as Hedges [Member] | Cash Flow Hedges [Member] | Commodity [Member] | Fair Value Level 2 [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 0 | 106
Automotive [Member] | Not Designated as Hedges [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 3,488 | 5,544
Notional amount, derivative liability | 1,188 | 651
Automotive [Member] | Not Designated as Hedges [Member] | Foreign Currency [Member] | Fair Value Level 2/3 [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 2,834 | 4,483
Notional amount, derivative liability | 1,188 | 470
Automotive [Member] | Not Designated as Hedges [Member] | Commodity [Member] | Fair Value Level 2 [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 606 | 1,061
Notional amount, derivative liability | 0 | 181
Automotive [Member] | Not Designated as Hedges [Member] | PSA Warrants [Member] | Fair Value Level 2 [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 48 | 0
Automotive [Member] | Not Designated as Hedges [Member] | Fair Value Hedges [Member] | PSA Warrants [Member] | Fair Value Level 2 [Member] |  |
Derivative [Line Items] |  |
Derivative asset | 764 |
GM Financial [Member] | Designated as Hedges [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 5,001 | 3,070
Notional amount, derivative liability | 9,860 | 8,991
GM Financial [Member] | Designated as Hedges [Member] | Cash Flow Hedges [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 3,751 | 3,070
Notional amount, derivative liability | 0 | 1,291
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 | 1,574 | 0
Notional amount, derivative liability | 0 | 791
GM Financial [Member] | Designated as Hedges [Member] | Cash Flow Hedges [Member] | Interest Rate Swaps [Member] | Fair Value Level 2/3 [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 2,177 | 3,070
Notional amount, derivative liability | 0 | 500
GM Financial [Member] | Designated as Hedges [Member] | Fair Value Hedges [Member] | Interest Rate Swaps [Member] | Fair Value Level 2 [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 1,250 | 0
Notional amount, derivative liability | 9,860 | 7,700
Derivative liability | 290 | 276
GM Financial [Member] | Not Designated as Hedges [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 56,782 | 17,657
Notional amount, derivative liability | 26,357 | 18,316
GM Financial [Member] | Not Designated as Hedges [Member] | Foreign Currency [Member] | Fair Value Level 2 [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 1,201 | 0
GM Financial [Member] | Not Designated as Hedges [Member] | Interest Rate Swaps [Member] | Fair Value Level 2/3 [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 38,741 | 7,959
Notional amount, derivative liability | 8,404 | 6,170
Derivative asset | 260 |
GM Financial [Member] | Not Designated as Hedges [Member] | Interest Rate Caps and Floors [Member] | Fair Value Level 2 [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 16,840 | 9,698
Notional amount, derivative liability | $ 17,953 | $ 12,146

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