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Derivative Financial Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Automotive [Member] | Designated as Hedges [Member]
Derivative [Line Items]
Notional amount, derivative asset	$ 2,501	$ 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	1,490	0
Automotive [Member] | Designated as Hedges [Member] | Cash Flow Hedges [Member]
Derivative [Line Items]
Notional amount, derivative asset	1,011	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	732	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	279	106
Automotive [Member] | Not Designated as Hedges [Member]
Derivative [Line Items]
Notional amount, derivative asset	11,185	5,666
Notional amount, derivative liability	2,447	651
Automotive [Member] | Not Designated as Hedges [Member] | Foreign Currency [Member] | Fair Value Level 2 [Member]
Derivative [Line Items]
Notional amount, derivative liability	2,083	470
Automotive [Member] | Not Designated as Hedges [Member] | Foreign Currency [Member] | Fair Value Level 2/3 [Member]
Derivative [Line Items]
Notional amount, derivative asset	4,200	4,605
Automotive [Member] | Not Designated as Hedges [Member] | Commodity [Member] | Fair Value Level 2 [Member]
Derivative [Line Items]
Notional amount, derivative asset	1,177	1,061
Notional amount, derivative liability	364	181
Automotive [Member] | Not Designated as Hedges [Member] | Interest Rate Swaps [Member] | Fair Value Level 2 [Member]
Derivative [Line Items]
Notional amount, derivative asset	5,808	0
GM Financial [Member] | Designated as Hedges [Member]
Derivative [Line Items]
Notional amount, derivative liability	10,469	9,771
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 liability	802	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	3,597	3,542
Notional amount, derivative liability	717	1,280
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 liability	8,950	7,700
Fair value of derivative liabilities	317	276
GM Financial [Member] | Not Designated as Hedges [Member]
Derivative [Line Items]
Notional amount, derivative asset	29,441	20,712
Notional amount, derivative liability	30,738	20,602
GM Financial [Member] | Not Designated as Hedges [Member] | Foreign Currency [Member] | Fair Value Level 2 [Member]
Derivative [Line Items]
Notional amount, derivative asset	617	1,576
Notional amount, derivative liability	1,412	119
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	15,455	8,667
Notional amount, derivative liability	14,225	8,337
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	13,369	10,469
Notional amount, derivative liability	$ 15,101	$ 12,146

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- 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
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