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Restructuring and Other Initiatives (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	$ 650	$ 1,151	$ 152	$ 520	$ 285	$ 285
Additions, interest accretion and other		161	7	1,396	11
Payments		(661)	(22)	(1,266)	(144)
Revisions to estimates and effect of foreign currency		(2)	(9)	0	(23)
Restructuring Reserve, Ending Balance		650	$ 129	650	$ 129	520
GMNA
Restructuring Reserve [Roll Forward]
Pre-tax restructuring costs		93		438		511
GMNA | Dealer Restructuring and Employee Separation Payments
Restructuring Reserve [Roll Forward]
Payments				(461)		$ (120)
GMNA | Dealer Restructuring and Employee Separation Payments | Forecast
Restructuring Reserve [Roll Forward]
Payments	(368)
GMNA | Voluntary Separation Program
Restructuring Reserve [Roll Forward]
Pre-tax restructuring costs		$ 30		905
GMNA | Voluntary Separation Program | Forecast
Restructuring Reserve [Roll Forward]
Payments	$ (138)
VSP | Dealer Restructuring and Employee Separation Payments
Restructuring Reserve [Roll Forward]
Payments				$ (767)

X

- Definition

Amount of any reversal and other adjustment made during the period to the amount of a previously accrued liability for a specified type of restructuring cost including foreign currency translation adjustments, excluding adjustments for costs incurred during the period and costs settled during the period.

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Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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Amount of restructuring charges, remediation cost, and asset impairment loss.

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