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Long-Term Investments (Tables) | 12 Months Ended
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Dec. 31, 2020
Investments Debt And Equity Securities [Abstract] |
Long-Term Investments |
|  | December 31, 2020 |  |  | December 31, 2019 |
Long-term investments |  |  | 10 |  |  |  | 11 |
Total |  |  | 10 |  |  |  | 11 |

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- Definition Tabular disclosure of the summary of investment holdings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B) -URI http://asc.fasb.org/extlink&oid=120401592&loc=d3e611197-123010 + Details
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