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Debt - Carrying Amount and Fair Value of Debt (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended
	Apr. 30, 2021	Sep. 30, 2021	Sep. 30, 2021	Dec. 31, 2020
Unsecured Debt | Line of Credit
Debt Instrument [Line Items]
Aggregate borrowing capacity	$ 11,200
Automotive
Debt Instrument [Line Items]
Finance lease liabilities		$ 314	$ 314	$ 237
Finance lease liabilities, Fair Value		329	329	256
Carrying Amount		16,848	16,848	17,469
Fair Value		20,569	20,569	21,576
Available under credit facility agreements		$ 17,207	$ 17,207	$ 18,222
Weighted-average interest rate on outstanding short-term debt		7.00%	7.00%	3.80%
Weighted-average interest rate on outstanding long-term debt		5.80%	5.80%	5.60%
Net discount and debt issuance costs		$ 519	$ 519	$ 540
Automotive | Secured Debt
Debt Instrument [Line Items]
Carrying Amount		237	237	303
Fair Value		256	256	332
Automotive | Unsecured Debt
Debt Instrument [Line Items]
Carrying Amount		16,297	16,297	16,929
Fair Value		19,984	19,984	20,988
Automotive | Level 1
Debt Instrument [Line Items]
Fair Value		19,063	19,063	19,826
Automotive | Level 2
Debt Instrument [Line Items]
Fair Value		1,506	1,506	1,750
GM Financial
Debt Instrument [Line Items]
Carrying Amount		92,105	92,105	92,425
Fair Value		93,964	93,964	94,948
GM Financial | Line of Credit
Debt Instrument [Line Items]
Aggregate borrowing capacity		21,900	21,900
GM Financial | Secured Debt
Debt Instrument [Line Items]
Carrying Amount		38,041	38,041	39,982
Fair Value		38,259	38,259	40,380
GM Financial | Unsecured Debt
Debt Instrument [Line Items]
Carrying Amount		54,064	54,064	52,443
Fair Value		$ 55,705	$ 55,705	54,568
GM Financial | Unsecured Debt | Line of Credit | $2.0 Billion Dollar Revolving Credit Facility
Debt Instrument [Line Items]
Debt term	364 days	364 days	364 days
Aggregate borrowing capacity	$ 2,000	$ 2,000	$ 2,000
GM Financial | Level 2
Debt Instrument [Line Items]
Fair Value		92,351	92,351	92,922
GM Financial | Level 3
Debt Instrument [Line Items]
Fair Value		$ 1,613	$ 1,613	$ 2,026

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Amount of unamortized debt discount (premium) and debt issuance costs.

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