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GM Financial Receivables and Transactions - Allowance for Loan Losses (Details) - GM Financial [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses at beginning of period	$ 924	$ 912	$ 911	$ 942
Provision for loan losses	179	128	354	264
Charge-offs	(279)	(298)	(588)	(593)
Recoveries	132	145	277	268
Effect of foreign currency	1	(14)	3	(8)
Allowance for loan losses at end of period	957	$ 873	957	$ 873
Collective allowance	605		605		$ 586
Specific allowance	$ 352		$ 352		$ 325

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- Definition

Amount of gain (loss) from converting allowance reserve for credit loss to currency of reporting entity from amount denominated or measured in a different currency, which decreases (increases) the allowance for loan and lease losses.

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of recovery of financing receivables doubtful of collection that were previously charged off.

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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