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Schedule of Unrealized and Realized Gains and Losses of Equity Securities Without Readily Determinable Fair Values (Detail) ¥ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2019 USD ($)
Equity Securities, FV-NI and without Readily Determinable Fair Value [Abstract] |  |  |  |  |
Initial cost basis |  | ¥ 21,211 |  | ¥ 26,728 | $ 3,047
Cumulative unrealized gains |  | 5,636 |  | 6,271 | 810
Cumulative unrealized losses (including impairment) |  | (2,161) |  | (3,730) | (311)
Total carrying value |  | 24,686 |  | 29,269 | $ 3,546
Gross unrealized gains |  | 1,447 | $ 208 | 7,119 |
Gross unrealized losses (including impairment) | [1] | (1,641) | (236) | (2,867) |
Net unrealized gains (losses) on equity securities held |  | (194) | (28) | 4,252 |
Net realized gains on equity securities sold |  | 211 | 30 | 124 |
Total net gains recognized in other income, net |  | ¥ 17 | $ 2 | ¥ 4,376 |
[1] | Gross unrealized losses (downward adjustments excluding impairment) were RMB2.4 billion and RMB863 million (US$124 million) for the years ended December 31, 2018 and 2019, respectively.

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- Definition Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=116654751&loc=SL75117546-209714 + Details
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