Debt - Debt Carrying Amount and Fair Value (Details) - USD ($) $ in Millions	1 Months Ended	6 Months Ended
Mar. 31, 2026	Jun. 30, 2026	Dec. 31, 2025
Automotive
Debt Instrument [Line Items]
Finance lease liabilities		$ 410	$ 615
Finance lease liabilities, Fair Value		408	614
Carrying Amount		15,979	16,247
Fair Value		15,804	16,213
Available under credit facility agreements		$ 13,900	$ 13,913
Weighted-average interest rate on outstanding short-term debt		4.80%	12.60%
Weighted-average interest rate on outstanding long-term debt		5.80%	5.80%
Net discount and debt issuance costs		$ 434	$ 445
Automotive \| Level 1
Debt Instrument [Line Items]
Fair Value		14,822	15,065
Automotive \| Level 2
Debt Instrument [Line Items]
Fair Value		983	1,148
GM Financial
Debt Instrument [Line Items]
Carrying Amount		111,719	114,031
Fair Value		112,887	115,860
GM Financial \| Level 2
Debt Instrument [Line Items]
Fair Value		110,049	113,180
GM Financial \| Level 3
Debt Instrument [Line Items]
Fair Value		2,839	2,679
Secured debt \| Automotive
Debt Instrument [Line Items]
Carrying Amount		236	164
Fair Value		236	164
Secured debt \| GM Financial
Debt Instrument [Line Items]
Carrying Amount		46,416	46,904
Fair Value		46,541	47,252
Unsecured debt \| Automotive
Debt Instrument [Line Items]
Carrying Amount		15,332	15,468
Fair Value		15,161	15,434
Unsecured debt \| GM Financial
Debt Instrument [Line Items]
Carrying Amount		65,303	67,127
Fair Value		$ 66,347	$ 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

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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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