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Namespace Prefix:	gm_
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Balance Type:	na
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- Definition

Emission Compliance Related Costs

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No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

Equipment on Operating Leases, net [Abstract]

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No definition available.

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Name:	gm_EquipmentOnOperatingLeasesNetAbstract
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The aggregate realized and unrealized foreign currency transaction gain or loss, net (pretax) or remeasurement gain or loss, net (pretax) included in determining net income for the reporting period. Represents the aggregate of gains or losses, net, on foreign currency transactions that are unsettled as of the balance sheet date, which is therefore an adjustment to reconcile income or loss from continuing operations to net cash provided by or used in continuing operations. Also includes the gains or losses associated with remeasuring foreign currency denominated entities into the functional currency of those entities. Excludes foreign currency transactions designated as hedges of net investment in a foreign entity.

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No definition available.

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Balance Type:	credit
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- Definition

Incentive Benefit Expense

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No definition available.

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Name:	gm_IncentiveBenefitExpense
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Balance Type:	debit
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- Definition

Maximum original maturity period threshold for securities that are considered highly liquid. 'P90D' represents the reported fact of 90 days.

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No definition available.

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- Definition

Maximum period past due before the accrual of finance charge income is suspended.

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No definition available.

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- Definition

Percentage threshold applied to uncertain tax positions to determine recognition of the tax benefit. If greater than this percentage, the largest amount of the tax benefit will be recognized.

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No definition available.

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Payments For Purchase Of Emissions Credits

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No definition available.

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Name:	gm_PaymentsForPurchaseOfEmissionsCredits
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

An expected return on plan asset methodology is utilized to calculate future pension expense for certain significant funded benefit plans. A market-related value of plan assets methodology is also utilized that averages gains and losses on the plan assets over a period of years to determine future pension expense. The element represents the percentage recognized of the difference between the fair value of assets and the expected calculated value in each of the next four years after the first year.

+ References

No definition available.

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No definition available.

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The period of time over which expected expense on pension plan assets is amortized, after the first year.

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No definition available.

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Revenue Recognition, Separate and Bundled Services, Term

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No definition available.

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Number of rolling years of actual and current year results utilized as the primary measure of cumulative losses for purposes of establishing the deferred tax asset valuation allowance.

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No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

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Balance Type:	na
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- References

No definition available.

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Data Type:	xbrli:stringItemType
Balance Type:	na
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No definition available.

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Balance Type:	na
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- References

No definition available.

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Data Type:	xbrli:stringItemType
Balance Type:	na
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- References

No definition available.

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Balance Type:	na
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- References

No definition available.

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- Definition

Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479773/842-30-50-3

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Balance Type:	na
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- Definition

The total expense recognized in the period for promotion, public relations, and brand or product advertising.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

+ Details

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- Definition

Amount of expense for research and development. Includes, but is not limited to, cost for computer software product to be sold, leased, or otherwise marketed and writeoff of research and development assets acquired in transaction other than business combination or joint venture formation or both. Excludes write-down of intangible asset acquired in business combination or from joint venture formation or both, used in research and development activity.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 48
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 985
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-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 730
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
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Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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-SubTopic 730
-Name Accounting Standards Codification
-Section 25
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479532/912-730-25-1

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Significant Accounting Policies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenue Recognition [Abstract]
Revenue recognition term of separate and bundled services	8 years
Cash Equivalents [Abstract]
Maximum maturity period for highly liquid securities	90 days
Amortization of Deferred Charges [Abstract]
Payment of purchase credits	$ 2,000	$ 500	$ 1,000
Carrying amount of acquired credits	2,100	1,000
Compliance related costs	$ 1,000	700	500
Pension and Other Postretirement Plans [Abstract]
Percentage recognized as pension expense in the first year	60.00%
Percentage of pension expense recognized in each of the next four years	10.00%
Subsequent period over which pension expense adjustment is amortized	4 years
Income Taxes [Abstract]
Number of years used for valuation allowance methodology	3 years
Minimum threshold to recognize the tax benefit for uncertain tax positions	50.00%
Foreign Currency Transactions and Translation [Abstract]
Foreign currency remeasurement and transaction (gains) losses	$ 321	(349)	(172)
Canada, United Kingdom and Germany
Pension and Other Postretirement Plans [Abstract]
Benefit obligation for pension plans (percent)	89.00%
Accounts Receivable, after Allowance for Credit Loss, Current
Government Assistance [Abstract]
Cash incentives receivable	$ 343
Property, Net
Government Assistance [Abstract]
Cash incentives receivable	480
Other assets
Government Assistance [Abstract]
Cash incentives receivable	292
Other liabilities
Government Assistance [Abstract]
Deferred incentive income in other liabilities	212
Automotive Selling, General and Administrative Expense
Advertising and Promotion Expenditures [Abstract]
Advertising and promotion expenditures	3,300	3,600	4,000
Automotive Cost of Sales
Research and Development Expenditures [Abstract]
Research and development expenditures	$ 9,200	$ 9,900	$ 9,800
GM Financial \| Retail Finance Receivables
Revenue Recognition [Abstract]
Period past due threshold for suspending accrual of finance charge income	60 days
GM Financial \| Commercial Portfolio Segment
Revenue Recognition [Abstract]
Period past due threshold for suspending accrual of finance charge income	90 days
GM Financial \| Minimum \| Equipment
Equipment on Operating Leases, net [Abstract]
Term of leasing arrangements	2 years
GM Financial \| Maximum \| Equipment
Equipment on Operating Leases, net [Abstract]
Term of leasing arrangements	5 years
Automotive \| Automotive Cost of Sales
Government Assistance [Abstract]
Incentive income	$ 524