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GM Financial Receivables and Transactions - Summary of Finance Receivables (Details) - GM Financial [Member] - USD ($) $ in Millions	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Finance Receivables [Line Items]
Finance receivables, collectively evaluated for impairment, net of fees	$ 52,743		$ 50,455
Finance receivables, individually evaluated for impairment, net of fees	2,403		2,389
GM Financial receivables	55,146		52,844
Less: allowance for loan losses	(957)	$ (924)	(911)	$ (873)	$ (912)	$ (942)
GM Financial receivables, net	54,189		51,933
Specific allowance	352		325
Retail Finance Receivables [Member]
Finance Receivables [Line Items]
Finance receivables, collectively evaluated for impairment, net of fees	40,237		38,220
Finance receivables, individually evaluated for impairment, net of fees	2,354		2,348
GM Financial receivables	42,591		40,568
Less: allowance for loan losses	(881)		(844)
GM Financial receivables, net	41,710		39,724
Specific allowance	341		321
Commercial Finance Receivables [Member]
Finance Receivables [Line Items]
Finance receivables, collectively evaluated for impairment, net of fees	12,506		12,235
Finance receivables, individually evaluated for impairment, net of fees	49		41
GM Financial receivables	12,555		12,276
Less: allowance for loan losses	(76)		(67)
GM Financial receivables, net	12,479		12,209
Dealer cash management balance	1,100		922
Level 2 [Member]
Finance Receivables [Line Items]
Fair value of GM Financial receivables	12,479		12,209
Level 3 [Member]
Finance Receivables [Line Items]
Fair value of GM Financial receivables	$ 42,050		$ 39,430

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