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Derivative Financial Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
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

X

- Definition

Nominal or face amount used to calculate payments on the derivative asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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+ References

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