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GM Financial Receivables and Transactions Summary of Finance Receivables (Details) - GM Financial [Member] - USD ($) $ in Millions	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Finance Receivables [Line Items]
Finance receivables, collectively evaluated for impairment, net of fees	$ 43,551		$ 40,421
Finance receivables, individually evaluated for impairment, net of fees	2,323		2,250
GM Financial receivables	45,874		42,671
Less: allowance for loan losses	(873)	$ (912)	(942)	$ (893)	$ (867)	$ (805)
GM Financial receivables, net	45,001		41,729
Fair value of GM Financial receivables	44,629		41,735
Retail Finance Receivables [Member]
Finance Receivables [Line Items]
Finance receivables, collectively evaluated for impairment, net of fees	33,278		30,486
Finance receivables, individually evaluated for impairment, net of fees	2,277		2,228
GM Financial receivables	35,555		32,714
Less: allowance for loan losses	(815)		(889)
GM Financial receivables, net	34,740		31,825
Commercial Finance Receivables [Member]
Finance Receivables [Line Items]
Finance receivables, collectively evaluated for impairment, net of fees	10,273		9,935
Finance receivables, individually evaluated for impairment, net of fees	46		22
GM Financial receivables	10,319		9,957
Less: allowance for loan losses	(58)		(53)
GM Financial receivables, net	$ 10,261		$ 9,904

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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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