Debt - Debt Carrying Amount and Fair Value (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
Mar. 31, 2026	Sep. 30, 2026	Dec. 31, 2025
Automotive
Debt Instrument [Line Items]
Finance lease liabilities		$ 397	$ 615
Finance lease liabilities, Fair Value		387	614
Carrying Amount		15,800	16,247
Fair Value		15,135	16,213
Available under credit facility agreements		$ 14,021	$ 13,913
Weighted-average interest rate on outstanding short-term debt		5.50%	12.60%
Weighted-average interest rate on outstanding long-term debt		5.80%	5.80%
Net discount and debt issuance costs		$ 427	$ 445
Automotive \| Level 1
Debt Instrument [Line Items]
Fair Value		14,090	15,065
Automotive \| Level 2
Debt Instrument [Line Items]
Fair Value		1,045	1,148
GM Financial
Debt Instrument [Line Items]
Carrying Amount		112,944	114,031
Fair Value		113,079	115,860
GM Financial \| Level 2
Debt Instrument [Line Items]
Fair Value		109,972	113,180
GM Financial \| Level 3
Debt Instrument [Line Items]
Fair Value		3,108	2,679
Secured debt \| Automotive
Debt Instrument [Line Items]
Carrying Amount		282	164
Fair Value		282	164
Secured debt \| GM Financial
Debt Instrument [Line Items]
Carrying Amount		49,484	46,904
Fair Value		49,372	47,252
Unsecured debt \| Automotive
Debt Instrument [Line Items]
Carrying Amount		15,120	15,468
Fair Value		14,466	15,434
Unsecured debt \| GM Financial
Debt Instrument [Line Items]
Carrying Amount		63,460	67,127
Fair Value		$ 63,708	$ 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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