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Accumulated Other Comprehensive Income - Tax Effect Allocated to Each Component of Other Comprehensive Income(loss) (Detail) ¥ in Millions, $ in Millions | 6 Months Ended
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Jun. 30, 2020 CNY (¥) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 CNY (¥)
Other Comprehensive Income (Loss), Tax [Abstract] |  |  |
Other comprehensive (loss)/income before reclassification | ¥ (40) | $ (6) | ¥ (171)
Amounts reclassified from accumulated other comprehensive income | 63 | 9 | 127
Net current-period other comprehensive (loss) income | ¥ 23 | $ 3 | ¥ (44)

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- Definition Amount, before adjustment, of tax expense (benefit) for unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e640-108580 + Details
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- Definition Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e640-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563 + Details
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