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Schedule of Unrealized Gains and Losses of Equity Securities Without Readily Determinable Fair Values Recognized (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] |  |  |  |
Net realized gains and losses on equity securities sold | $ 0 | ¥ 0 | $ 18 | ¥ 124
Net unrealized gains and losses on equity securities held | 143 | 981 | 609 | 4,183
Total net gains recognized in other income | $ 143 | ¥ 981 | $ 627 | ¥ 4,307

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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=84241550&loc=SL75117546-209714 + Details
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- Definition Amount of realized gain (loss) from sale of 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=84241550&loc=SL75117546-209714 + Details
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- Definition Amount of unrealized 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=84241550&loc=SL75117546-209714 + Details
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