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Segment Reporting Revenues and long-lived assets by geographic region (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales and revenue |  |  |  |  |  |  |  |  | $ 133,449 | $ 140,205 | $ 129,864
GM Financial revenue |  |  |  |  |  |  |  |  | 12,139 | 8,979 | 5,861
Total net sales and revenue | $ 37,715 | $ 33,623 | $ 36,984 | $ 37,266 | $ 39,896 | $ 38,889 | $ 37,383 | $ 33,016 | 145,588 | 149,184 | 135,725
Long-Lived Assets | 80,329 |  |  |  | 68,055 |  |  |  | 80,329 | 68,055 | 50,990
Automotive [Member] | U.S. [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales and revenue |  |  |  |  |  |  |  |  | 100,674 | 110,661 | 100,082
Long-Lived Assets | 24,473 |  |  |  | 22,241 |  |  |  | 24,473 | 22,241 | 21,091
Automotive [Member] | Non-U.S. [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales and revenue |  |  |  |  |  |  |  |  | 32,775 | 29,544 | 29,782
Long-Lived Assets | 12,715 |  |  |  | 11,258 |  |  |  | 12,715 | 11,258 | 9,649
GM Financial [Member] | U.S. [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
GM Financial revenue |  |  |  |  |  |  |  |  | 10,489 | 7,462 | 4,357
Long-Lived Assets | 40,674 |  |  |  | 32,506 |  |  |  | 40,674 | 32,506 | 18,501
GM Financial [Member] | Non-U.S. [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
GM Financial revenue |  |  |  |  |  |  |  |  | 1,650 | 1,517 | 1,504
Long-Lived Assets | $ 2,467 |  |  |  | $ 2,050 |  |  |  | $ 2,467 | $ 2,050 | $ 1,749

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- Definition The aggregate financial services revenue and operating interest income earned during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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