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GM Financial Receivables and Transactions - Intercompany Transactions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
GM Financial [Member]
Related Party Transaction [Line Items]
Financing receivable, net	$ 51,850		$ 51,850		$ 52,956
Common stock dividends declared and paid	400		800
GM Financial [Member] | Commercial Finance Receivables [Member]
Related Party Transaction [Line Items]
Financing receivable, net	7,422		7,422		11,593
GM Financial [Member] | Retail Finance Receivables [Member]
Related Party Transaction [Line Items]
Financing receivable, net	44,428		44,428		41,363
Intersegment Eliminations [Member]
Related Party Transaction [Line Items]
Cash payments to GM Financial	967	$ 959	2,000	$ 2,000
Intersegment Eliminations [Member] | GM Financial [Member]
Related Party Transaction [Line Items]
Subvention receivable	618		618		676
Loans receivable	947		947		0
Interest subvention earned on finance receivables	162	147	318	295
Leased vehicle subvention earned	765	$ 818	1,570	$ 1,653
Intersegment Eliminations [Member] | GM Financial [Member] | Commercial Finance Receivables [Member]
Related Party Transaction [Line Items]
Financing receivable, net	395		395		478
Commercial loan funding payable	52		52		74
Intersegment Eliminations [Member] | GM Financial [Member] | Retail Finance Receivables [Member]
Related Party Transaction [Line Items]
Financing receivable, net	$ 17		$ 17		$ 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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Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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