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GM Financial Receivables and Transactions - Summary of Finance Receivables (Details) - GM Financial [Member] - USD ($) $ in Millions	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Finance Receivables [Line Items]
Finance receivables, collectively evaluated for impairment, net of fees	$ 52,263		$ 50,455
Finance receivables, individually evaluated for impairment, net of fees	2,430		2,389
GM Financial receivables	54,693		52,844
Less: allowance for loan losses	(933)	$ (957)	(911)	$ (900)	$ (873)	$ (942)
GM Financial receivables, net	53,760		51,933
Specific allowance	348		325
Retail Finance Receivables [Member]
Finance Receivables [Line Items]
Finance receivables, collectively evaluated for impairment, net of fees	39,507		38,220
Finance receivables, individually evaluated for impairment, net of fees	2,390		2,348
GM Financial receivables	41,897		40,568
Less: allowance for loan losses	(856)		(844)
GM Financial receivables, net	41,041		39,724
Specific allowance	337		321
Commercial Finance Receivables [Member]
Finance Receivables [Line Items]
Finance receivables, collectively evaluated for impairment, net of fees	12,756		12,235
Finance receivables, individually evaluated for impairment, net of fees	40		41
GM Financial receivables	12,796		12,276
Less: allowance for loan losses	(77)		(67)
GM Financial receivables, net	12,719		12,209
Dealer cash management balance	1,200		922
Level 2 [Member]
Finance Receivables [Line Items]
Fair value of GM Financial receivables	12,719		12,209
Level 3 [Member]
Finance Receivables [Line Items]
Fair value of GM Financial receivables	$ 41,557		$ 39,430

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