Debt - Debt Carrying Amount and Fair Value (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
Mar. 31, 2026	Mar. 31, 2026	Dec. 31, 2025
Automotive
Debt Instrument [Line Items]
Finance lease liabilities	$ 431	$ 431	$ 615
Finance lease liabilities, Fair Value	431	431	614
Carrying Amount	15,927	15,927	16,247
Fair Value	15,592	15,592	16,213
Available under credit facility agreements	$ 13,961	$ 13,961	$ 13,913
Weighted-average interest rate on outstanding short-term debt	5.10%	5.10%	12.60%
Weighted-average interest rate on outstanding long-term debt	5.80%	5.80%	5.80%
Net discount and debt issuance costs	$ 443	$ 443	$ 445
Automotive \| Level 1
Debt Instrument [Line Items]
Fair Value	14,724	14,724	15,065
Automotive \| Level 2
Debt Instrument [Line Items]
Fair Value	868	868	1,148
GM Financial
Debt Instrument [Line Items]
Carrying Amount	111,827	111,827	114,031
Fair Value	112,821	112,821	115,860
GM Financial \| Level 2
Debt Instrument [Line Items]
Fair Value	110,015	110,015	113,180
GM Financial \| Level 3
Debt Instrument [Line Items]
Fair Value	2,806	2,806	2,679
Secured debt \| Automotive
Debt Instrument [Line Items]
Carrying Amount	106	106	164
Fair Value	106	106	164
Secured debt \| GM Financial
Debt Instrument [Line Items]
Carrying Amount	46,823	46,823	46,904
Fair Value	47,026	47,026	47,252
Unsecured debt \| Automotive
Debt Instrument [Line Items]
Carrying Amount	15,390	15,390	15,468
Fair Value	15,055	15,055	15,434
Unsecured debt \| GM Financial
Debt Instrument [Line Items]
Carrying Amount	65,005	65,005	67,127
Fair Value	$ 65,795	$ 65,795	$ 68,607
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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- 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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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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