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GM Financial Receivables and Transactions Summary of Finance Receivables (Details) - GM Financial [Member] - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finance Receivables [Line Items]
Finance receivables, collectively evaluated for impairment, net of fees	$ 50,455	$ 40,421
Finance receivables, individually evaluated for impairment, net of fees	2,389	2,250
GM Financial receivables	52,844	42,671
Less: allowance for loan losses	(911)	(942)	$ (805)	$ (749)
GM Financial receivables, net	51,933	41,729
Commercial Finance Receivables [Member]
Finance Receivables [Line Items]
Finance receivables, collectively evaluated for impairment, net of fees	12,235	9,935
Finance receivables, individually evaluated for impairment, net of fees	41	22
GM Financial receivables	12,276	9,957
Less: allowance for loan losses	(67)	(53)
GM Financial receivables, net	12,209	9,904
Dealer cash management balances	922	536
Retail Finance Receivables [Member]
Finance Receivables [Line Items]
Finance receivables, collectively evaluated for impairment, net of fees	38,220	30,486
Finance receivables, individually evaluated for impairment, net of fees	2,348	2,228
GM Financial receivables	40,568	32,714
Less: allowance for loan losses	(844)	(889)
GM Financial receivables, net	39,724	31,825
Level 2 [Member]
Finance Receivables [Line Items]
Fair value of GM Financial receivables	12,209	9,904
Level 3 [Member]
Finance Receivables [Line Items]
Fair value of GM Financial receivables	$ 39,430	$ 31,831

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A valuation allowance for financing receivables that are expected to be uncollectible.

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