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Derivative Financial Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Automotive [Member] | Designated as Hedges [Member]
Derivative [Line Items]
Notional amount, derivative asset	$ 1,743	$ 909
Automotive [Member] | Designated as Hedges [Member] | Net Investment Hedges [Member] | Foreign Currency [Member] | Fair Value Level 2 [Member]
Derivative [Line Items]
Notional amount, derivative asset	1,583	0
Automotive [Member] | Designated as Hedges [Member] | Cash Flow Hedges [Member]
Derivative [Line Items]
Notional amount, derivative asset	160	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	160	106
Automotive [Member] | Not Designated as Hedges [Member]
Derivative [Line Items]
Notional amount, derivative asset	5,018	5,544
Notional amount, derivative liability	8,673	651
Automotive [Member] | Not Designated as Hedges [Member] | Foreign Currency [Member] | Fair Value Level 2 [Member]
Derivative [Line Items]
Notional amount, derivative asset	4,295	4,483
Notional amount, derivative liability	2,173	470
Automotive [Member] | Not Designated as Hedges [Member] | Commodity [Member] | Fair Value Level 2 [Member]
Derivative [Line Items]
Notional amount, derivative asset	723	1,061
Notional amount, derivative liability	307	181
Automotive [Member] | Not Designated as Hedges [Member] | Interest Rate Swaps [Member] | Fair Value Level 2 [Member]
Derivative [Line Items]
Notional amount, derivative liability	6,193	0
GM Financial [Member] | Designated as Hedges [Member]
Derivative [Line Items]
Notional amount, derivative asset	5,821	3,070
Notional amount, derivative liability	9,310	8,991
GM Financial [Member] | Designated as Hedges [Member] | Cash Flow Hedges [Member]
Derivative [Line Items]
Notional amount, derivative asset	3,321	3,070
Notional amount, derivative liability	456	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	855	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	2,466	3,070
Notional amount, derivative liability	456	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	2,500	0
Notional amount, derivative liability	8,854	7,700
Fair value of derivative liabilities	238	276
GM Financial [Member] | Not Designated as Hedges [Member]
Derivative [Line Items]
Notional amount, derivative asset	41,369	17,657
Notional amount, derivative liability	35,791	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	1,141	0
Notional amount, derivative liability	331	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	24,881	7,959
Notional amount, derivative liability	17,746	6,170
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	15,347	9,698
Notional amount, derivative liability	$ 17,714	$ 12,146

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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