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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 | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2020 CNY (¥) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 CNY (¥) | Jun. 30, 2020 USD ($) | Dec. 31, 2019 CNY (¥)
Equity Securities, FV-NI and without Readily Determinable Fair Value [Abstract] |  |  |  |  |
Initial cost basis | ¥ 21,911 |  |  | $ 3,101 | ¥ 21,211
Cumulative unrealized gains | 6,884 |  |  | 974 | 5,636
Cumulative unrealized losses (including impairment) | (4,272) |  |  | (605) | (2,161)
Total carrying value | 24,523 |  |  | $ 3,470 | ¥ 24,686
Gross unrealized gains | 1,340 | $ 190 | ¥ 1,157 |  |
Gross unrealized losses (including impairment) | (2,689) | (381) | (527) |  |
Net unrealized gains (losses) on equity securities held | (1,349) | (191) | 630 |  |
Net realized gains on equity securities sold | 252 | 36 | 222 |  |
Total net gains recognized in other income, net | ¥ (1,097) | $ (155) | ¥ 852 |  |

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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=120269885&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=120269885&loc=SL75117546-209714 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(d)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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