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GM Financial Receivables Summary of Finance Receivables (Details) - GM Financial [Member] - USD ($) $ in Millions	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Finance Receivables [Line Items]
Finance receivables, collectively evaluated for impairment, net of fees	$ 38,279		$ 31,986
Finance receivables, individually evaluated for impairment, net of fees	2,047		1,947
GM Financial receivables	40,326		33,933
Less: allowance for loan losses	(893)	$ (867)	(805)	$ (828)	$ (808)	$ (749)
GM Financial receivables, net	39,433		33,128
Fair value of GM Financial receivables	39,477		33,181
Retail Finance Receivables [Member]
Finance Receivables [Line Items]
Finance receivables, collectively evaluated for impairment, net of fees	28,971		24,480
Finance receivables, individually evaluated for impairment, net of fees	2,012		1,920
GM Financial receivables	30,983		26,400
Less: allowance for loan losses	(844)		(765)
GM Financial receivables, net	30,139		25,635
Commercial Finance Receivables [Member]
Finance Receivables [Line Items]
Finance receivables, collectively evaluated for impairment, net of fees	9,308		7,506
Finance receivables, individually evaluated for impairment, net of fees	35		27
GM Financial receivables	9,343		7,533
Less: allowance for loan losses	(49)		(40)
GM Financial receivables, net	$ 9,294		$ 7,493

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

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

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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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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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Fair value portion of receivables, including, but not limited to, trade account receivables, note receivables, and loan receivables.

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