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Debt - Interest Expense and LT Debt Maturities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Total interest expense	$ 5,596	$ 3,868	$ 3,496
2024	39,065
2025	25,615
2026	15,142
2027	10,596
2028	7,995
Thereafter	25,081
Total	123,494
Automotive
Debt Instrument [Line Items]
Automotive interest expense	911	987	950
2024	428
2025	2,644
2026	93
2027	1,826
2028	831
Thereafter	11,082
Total	16,905
GM Financial
Debt Instrument [Line Items]
Financing interest expense	4,685	$ 2,881	$ 2,546
2024	38,637
2025	22,971
2026	15,049
2027	8,770
2028	7,164
Thereafter	13,999
Total	$ 106,590

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