GM Financial Receivables (Tables) - GM Financial [Member]

12 Months Ended

Dec. 31, 2017

Finance Receivables [Line Items]

GM Financial Receivables

	December 31, 2017									December 31, 2016
	Retail			Commercial			Total			Retail			Commercial			Total
Finance receivables, collectively evaluated for impairment, net of fees	$	30,486		$	9,935		$	40,421		$	24,480		$	7,506		$	31,986
Finance receivables, individually evaluated for impairment, net of fees	2,228			22			2,250			1,920			27			1,947
GM Financial receivables	32,714			9,957			42,671			26,400			7,533			33,933
Less: allowance for loan losses	(889		)	(53		)	(942		)	(765		)	(40		)	(805		)
GM Financial receivables, net	$	31,825		$	9,904		$	41,729		$	25,635		$	7,493		$	33,128
Fair value of GM Financial receivables							$	41,735								$	33,181

Allowance for Loan Losses

	Years Ended December 31,
	2017			2016			2015
Allowance for loan losses at beginning of period	$	805		$	749		$	668
Provision for loan losses	757			644			603
Charge-offs	(1,173		)	(1,137		)	(969		)
Recoveries	552			542			469
Effect of foreign currency	1			7			(22		)
Allowance for loan losses at end of period	$	942		$	805		$	749

Retail Finance Receivables [Member]

Finance Receivables [Line Items]

Retail Finance Receivables Delinquency

The following table summarizes the contractual amount of delinquent retail finance receivables, which is not significantly different than the recorded investment of the retail finance receivables:

	December 31, 2017				December 31, 2016
	Amount		Percent of Contractual Amount Due		Amount		Percent of Contractual Amount Due
31-to-60 days delinquent	$	1,334	4.1	%	$	1,220	4.6	%
Greater-than-60 days delinquent	559		1.7	%	532		2.0	%
Total finance receivables more than 30 days delinquent	1,893		5.8	%	1,752		6.6	%
In repossession	27		—	%	47		0.2	%
Total finance receivables more than 30 days delinquent or in repossession	$	1,920	5.8	%	$	1,799	6.8	%

Commercial [Member]

Finance Receivables [Line Items]

Commercial Finance Receivables Credit Quality

The following table summarizes the credit risk profile by dealer risk rating of the commercial finance receivables: 

		December 31, 2017		December 31, 2016
Group I	– Dealers with superior financial metrics	$	1,915	$	1,372
Group II	– Dealers with strong financial metrics	3,465		2,526
Group III	– Dealers with fair financial metrics	3,239		2,598
Group IV	– Dealers with weak financial metrics	997		613
Group V	– Dealers warranting special mention due to elevated risks	260		334
Group VI	– Dealers with loans classified as substandard, doubtful or impaired	81		90
		$	9,957	$	7,533