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Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Goodwill [Line Items]
Goodwill	$ 1,900	$ 1,900
GM Financial
Goodwill [Line Items]
Goodwill	1,300	1,300
Cruise
Goodwill [Line Items]
Goodwill	$ 569	$ 573

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Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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