Debt - Debt Carrying Amount and Fair Value (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
Mar. 31, 2024	Sep. 30, 2024	Dec. 31, 2023
Automotive
Debt Instrument [Line Items]
Finance lease liabilities		$ 391	$ 437
Finance lease liabilities, Fair Value		411	447
Carrying Amount		16,484	16,413
Fair Value		16,448	16,490
Available under credit facility agreements		$ 13,561	$ 16,446
Weighted-average interest rate on outstanding short-term debt		8.30%	16.20%
Weighted-average interest rate on outstanding long-term debt		5.80%	5.80%
Net discount and debt issuance costs		$ 481	$ 527
Automotive \| Level 1
Debt Instrument [Line Items]
Fair Value		15,530	15,457
Automotive \| Level 2
Debt Instrument [Line Items]
Fair Value		918	1,033
GM Financial
Debt Instrument [Line Items]
Carrying Amount		111,367	105,327
Fair Value		112,183	104,622
GM Financial \| Level 2
Debt Instrument [Line Items]
Fair Value		110,055	102,262
GM Financial \| Level 3
Debt Instrument [Line Items]
Fair Value		2,129	2,360
Secured Debt \| Automotive
Debt Instrument [Line Items]
Carrying Amount		176	134
Fair Value		175	132
Secured Debt \| GM Financial
Debt Instrument [Line Items]
Carrying Amount		43,570	45,243
Fair Value		43,830	44,971
Unsecured Debt \| Automotive
Debt Instrument [Line Items]
Carrying Amount		15,916	15,842
Fair Value		15,862	15,911
Unsecured Debt \| GM Financial
Debt Instrument [Line Items]
Carrying Amount		67,796	60,084
Fair Value		$ 68,354	$ 59,651
Unsecured Debt \| GM Financial \| $2.0 Billion Dollar Revolving Credit Facility \| Line of Credit
Debt Instrument [Line Items]
Debt term	364 days	364 days
Aggregate borrowing capacity	$ 2,000	$ 2,000

Debt And Finance Lease Liabilities

No definition available.

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- Definition

Finance Lease Liabilities, Fair Value Disclosure

+ References

No definition available.

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- Definition

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

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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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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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- Definition

Present value of lessee's discounted obligation for lease payments from finance lease.

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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 of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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