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Goodwill (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Sep. 30, 2025	Dec. 31, 2024
Goodwill [Line Items]
Goodwill		$ 1,900	$ 1,900
GM Financial
Goodwill [Line Items]
Goodwill		1,300	1,300
GMNA
Goodwill [Line Items]
Goodwill		$ 571
Goodwill, transfers	$ 571
Cruise
Goodwill [Line Items]
Goodwill			$ 569
Goodwill, transfers	$ (571)

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