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GM Financial Receivables and Transactions Summary of Finance Receivables (Details) - GM Financial [Member] - USD ($) $ in Millions	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Finance Receivables [Line Items]
Finance receivables, collectively evaluated for impairment, net of fees	$ 46,043		$ 40,421
Finance receivables, individually evaluated for impairment, net of fees	2,375		2,250
GM Financial receivables	48,418		42,671
Less: allowance for loan losses	(900)	$ (873)	(942)	$ (948)	$ (893)	$ (805)
GM Financial receivables, net	47,518		41,729
Retail Finance Receivables [Member]
Finance Receivables [Line Items]
Finance receivables, collectively evaluated for impairment, net of fees	35,442		30,486
Finance receivables, individually evaluated for impairment, net of fees	2,308		2,228
GM Financial receivables	37,750		32,714
Less: allowance for loan losses	(839)		(889)
GM Financial receivables, net	36,911		31,825
Commercial Finance Receivables [Member]
Finance Receivables [Line Items]
Finance receivables, collectively evaluated for impairment, net of fees	10,601		9,935
Finance receivables, individually evaluated for impairment, net of fees	67		22
GM Financial receivables	10,668		9,957
Less: allowance for loan losses	(61)		(53)
GM Financial receivables, net	10,607		9,904
Level 2 [Member]
Finance Receivables [Line Items]
Fair value of GM Financial receivables	10,607		9,904
Level 3 [Member]
Finance Receivables [Line Items]
Fair value of GM Financial receivables	$ 36,551		$ 31,831

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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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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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