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GM Financial Receivables and Transactions - Intercompany Transactions (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
GM Financial [Member]
Related Party Transaction [Line Items]
Financing receivable, net	$ 52,268	$ 52,268		$ 52,956
Common stock dividends declared and paid	400
GM Financial [Member] | Commercial Finance Receivables [Member]
Related Party Transaction [Line Items]
Financing receivable, net	11,673	11,673		11,593
GM Financial [Member] | Retail Finance Receivables [Member]
Related Party Transaction [Line Items]
Financing receivable, net	40,595	40,595		41,363
Intersegment Eliminations [Member]
Related Party Transaction [Line Items]
Cash payments to GM Financial		1,100	$ 1,100
Intersegment Eliminations [Member] | GM Financial [Member]
Related Party Transaction [Line Items]
Subvention receivable	668	668		676
Interest subvention earned on finance receivables		156	148
Leased vehicle subvention earned		805	$ 835
Intersegment Eliminations [Member] | GM Financial [Member] | Commercial Finance Receivables [Member]
Related Party Transaction [Line Items]
Financing receivable, net	522	522		478
Commercial loan funding payable	38	38		74
Intersegment Eliminations [Member] | GM Financial [Member] | Retail Finance Receivables [Member]
Related Party Transaction [Line Items]
Financing receivable, net	$ 30	$ 30		$ 39

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

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