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GM Financial Receivables Summary of Finance Receivables, (Details) - GM Financial [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Finance Receivables [Line Items]
Finance Receivables, Collectively Evaluated for Impairment, net of fees	$ 41,641	$ 35,639
Finance Receivables, Individually Evaluated for Impairment, net of fees	1,991	1,694
GM Financial Receivables	43,632	37,333
Less: Allowance for Loan Losses	(843)	(782)	$ (695)	$ (548)
GM Financial Receivables, Net	42,789	36,551
Fair Value of GM Financial Receivables	42,739	36,707
Commercial Finance Receivables [Member]
Finance Receivables [Line Items]
Finance Receivables, Collectively Evaluated for Impairment, net of fees	10,652	8,127
Finance Receivables, Individually Evaluated for Impairment, net of fees	70	82
GM Financial Receivables	10,722	8,209
Less: Allowance for Loan Losses	(50)	(47)
GM Financial Receivables, Net	$ 10,672	8,162
Commercial Finance Receivables [Member] | Level 2 [Member]
Finance Receivables [Line Items]
Maximum Maturity Period for Finance Receivables	1 year
Retail Finance Receivables [Member]
Finance Receivables [Line Items]
Finance Receivables, Collectively Evaluated for Impairment, net of fees	$ 30,989	27,512
Finance Receivables, Individually Evaluated for Impairment, net of fees	1,921	1,612
GM Financial Receivables	32,910	29,124
Less: Allowance for Loan Losses	(793)	(735)
GM Financial Receivables, Net	$ 32,117	$ 28,389

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- Definition

Maximum maturity period threshold for the carrying amount of finance receivables to be considered a reasonable estimate of fair value. In 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

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The balance of financing receivables that were collectively evaluated for impairment.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
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The balance of financing receivables that were individually evaluated for impairment.

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Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-SubTopic 210
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Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Fair value portion of receivables, including, but not limited to, trade account receivables, note receivables, and loan receivables.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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