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GM Financial Receivables and Transactions Summary of Finance Receivables (Details) - GM Financial [Member] - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Finance Receivables [Line Items]
Finance receivables, collectively evaluated for impairment, net of fees	$ 51,235	$ 50,455
Finance receivables, individually evaluated for impairment, net of fees(b)	2,367	2,389
GM Financial receivables	53,602	52,844
Less: allowance for loan losses(b)	(924)	(911)	$ (912)	$ (942)
GM Financial receivables, net	52,678	51,933
Specific allowance	326	325
Retail Finance Receivables [Member]
Finance Receivables [Line Items]
Finance receivables, collectively evaluated for impairment, net of fees	39,331	38,220
Finance receivables, individually evaluated for impairment, net of fees(b)	2,333	2,348
GM Financial receivables	41,664	40,568
Less: allowance for loan losses(b)	(862)	(844)
GM Financial receivables, net	40,802	39,724
Specific allowance	324	321
Commercial Finance Receivables [Member]
Finance Receivables [Line Items]
Finance receivables, collectively evaluated for impairment, net of fees	11,904	12,235
Finance receivables, individually evaluated for impairment, net of fees(b)	34	41
GM Financial receivables	11,938	12,276
Less: allowance for loan losses(b)	(62)	(67)
GM Financial receivables, net	11,876	12,209
Dealer cash management balance	1,100	922
Level 2 [Member]
Finance Receivables [Line Items]
Fair value of GM Financial receivables	11,876	12,209
Level 3 [Member]
Finance Receivables [Line Items]
Fair value of GM Financial receivables	$ 40,830	$ 39,430

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