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Schedule of Unrealized Gains and Losses of Equity Securities Without Readily Determinable Fair Values (Detail) ¥ in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 USD ($) | Sep. 30, 2018 CNY (¥) | Sep. 30, 2018 USD ($) | Sep. 30, 2018 CNY (¥)
Equity Securities, FV-NI and without Readily Determinable Fair Value [Abstract] |  |  |  |
Gross unrealized gains (upward adjustments) | $ 154 | ¥ 1,059 | $ 941 | ¥ 6,463
Gross unrealized losses (downward adjustments excluding impairment) | $ (11) | ¥ (78) | $ (332) | ¥ (2,280)

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- Definition Amount of loss from downward price adjustment on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84241550&loc=SL75117539-209714 + Details
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- Definition Amount of gain from upward price adjustment on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84241550&loc=SL75117539-209714 + Details
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