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Debt - Interest Expense and LT Debt Maturities (Details) - USD ($) $ in Millions | 12 Months Ended
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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 No definition available. + Details
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- Definition Long-term Debt and Finance Lease Obligations, Maturities, Repayments of Principal in Year Five + References No definition available. + Details
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- Definition Long-term Debt and Finance Lease Obligations, Maturities, Repayments of Principal in Year Four + References No definition available. + Details
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- Definition Long-term Debt and Finance Lease Obligations, Maturities, Repayments of Principal in Year Three + References No definition available. + Details
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- Definition Long-term Debt and Finance Lease Obligations, Maturities, Repayments of Principal in Year Two + References No definition available. + Details
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- Definition Long-term Debt and Finance Lease Obligations, Repayments of Principal in Next Twelve Months + References No definition available. + Details
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- Definition This element represents interest incurred for borrowed money which was used to produce goods or render services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (210.5-03(11)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
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