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Debt - Carrying Amount and Fair Value of Debt (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended
	Apr. 30, 2021	Jun. 30, 2021	Jun. 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		$ 317	$ 317	$ 237
Finance lease liabilities, Fair Value		335	335	256
Carrying Amount		17,318	17,318	17,469
Fair Value		21,369	21,369	21,576
Available under credit facility agreements(b)		$ 17,189,000	$ 17,189,000	$ 18,222,000
Weighted-average interest rate on outstanding short-term debt		3.00%	3.00%	3.80%
Weighted-average interest rate on outstanding long-term debt		5.70%	5.70%	5.60%
Net discount and debt issuance costs		$ 545	$ 545	$ 540
Automotive | Secured Debt
Debt Instrument [Line Items]
Carrying Amount		258	258	303
Fair Value		278	278	332
Automotive | Unsecured Debt
Debt Instrument [Line Items]
Carrying Amount		16,743	16,743	16,929
Fair Value		20,756	20,756	20,988
Automotive | Level 1
Debt Instrument [Line Items]
Fair Value		19,811	19,811	19,826
Automotive | Level 2
Debt Instrument [Line Items]
Fair Value		1,558	1,558	1,750
GM Financial
Debt Instrument [Line Items]
Carrying Amount		93,570	93,570	92,425
Fair Value		95,767	95,767	94,948
GM Financial | Line of Credit
Debt Instrument [Line Items]
Aggregate borrowing capacity		18,700	18,700
GM Financial | Secured Debt
Debt Instrument [Line Items]
Carrying Amount		38,999	38,999	39,982
Fair Value		39,272	39,272	40,380
GM Financial | Unsecured Debt
Debt Instrument [Line Items]
Carrying Amount		54,571	54,571	52,443
Fair Value		$ 56,495	$ 56,495	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		93,907	93,907	92,922
GM Financial | Level 3
Debt Instrument [Line Items]
Fair Value		$ 1,860	$ 1,860	$ 2,026

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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