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Subsequent Events (Details) - USD ($) $ in Millions | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Jan. 31, 2021 | Feb. 10, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Subsequent Event [Line Items] |  |  |  |
Deferred tax assets valuation allowance |  |  | $ 9,095 | $ 8,135
Subsequent Event | GM Cruise |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Deferred tax assets valuation allowance |  | $ 350 |  |
Subsequent Event | Series G Preferred Shares | GM Cruise | Microsoft and other investors |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Proceeds from sale of stock | $ 2,200 |  |  |
Subsequent Event | Series G Preferred Shares | GM Cruise | General Motors Holdings LLC |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Proceeds from sale of stock | $ 1,000 |  |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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