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GM Financial Receivables and Transactions - Intercompany Transactions (Details) - USD ($) $ in Millions	1 Months Ended		12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
GM Financial
Related Party Transactions [Line Items]
Financing receivable, net			$ 52,956	$ 51,933
Common stock dividends declared	$ 400	$ 375
GM Financial | Commercial Portfolio Segment
Related Party Transactions [Line Items]
Financing receivable, net			11,593	12,209
GM Financial | Retail Finance Receivables
Related Party Transactions [Line Items]
Financing receivable, net			41,363	39,724
Eliminations/ Reclassifications
Related Party Transactions [Line Items]
Cash payments to GM Financial			4,100	3,800	$ 4,300
Eliminations/ Reclassifications | GM Financial
Related Party Transactions [Line Items]
Subvention receivable			676	727
Interest subvention earned on finance receivables			588	554	492
Leased vehicle subvention earned			3,273	3,274	$ 3,046
Eliminations/ Reclassifications | GM Financial | Commercial Portfolio Segment
Related Party Transactions [Line Items]
Financing receivable, net			478	445
Commercial loan funding payable			74	61
Eliminations/ Reclassifications | GM Financial | Retail Finance Receivables
Related Party Transactions [Line Items]
Financing receivable, net			$ 39	$ 134

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