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Debt - Interest Expense and LT Debt Maturities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Total interest expense	$ 4,121	$ 4,423	$ 3,880
2021	37,018
2022	19,449
2023	17,860
2024	7,894
2025	9,187
Thereafter	18,616
Total	110,024
Automotive
Debt Instrument [Line Items]
Total interest expense	1,098	782	655
2021	1,276
2022	137
2023	2,593
2024	86
2025	2,578
Thereafter	11,339
Total	18,009
GM Financial
Debt Instrument [Line Items]
Financing interest expense	3,023	$ 3,641	$ 3,225
2021	35,742
2022	19,312
2023	15,267
2024	7,808
2025	6,609
Thereafter	7,277
Total	$ 92,015

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- Definition

Long-term Debt and Finance Lease Obligations, Maturities, Repayments of Principal after Year Five

+ References

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- Definition

Long-term Debt and Finance Lease Obligations, Maturities, Repayments of Principal in Year Five

+ References

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- Definition

Long-term Debt and Finance Lease Obligations, Maturities, Repayments of Principal in Year Four

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- Definition

Long-term Debt and Finance Lease Obligations, Maturities, Repayments of Principal in Year Three

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- Definition

Long-term Debt and Finance Lease Obligations, Maturities, Repayments of Principal in Year Two

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- Definition

Long-term Debt and Finance Lease Obligations, Repayments of Principal in Next Twelve Months

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

This element represents interest incurred for borrowed money which was used to produce goods or render services.

+ References

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-Topic 220
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-Paragraph 2
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- Definition

Amount of the cost of borrowed funds accounted for as interest expense.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
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Amount of long-term debt and lease obligation, including portion classified as current.

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