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Fair Value Measurements - Schedule of Available-for-sale debt investments (Detail) - Available-for-sale Securities [Member] ¥ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CNY (¥)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Begining Balance | ¥ 1,167 |  | ¥ 0
Additions | 2,785 |  | 1,167
Disposals | (20) |  |
Net unrealized fair value increase recognized in other comprehensive income | 91 |  |
Accrued interest | 48 |  |
Impairment | (81) |  |
Foreign currency translation adjustments | (20) |  |
Ending balance | ¥ 3,970 | $ 570 | ¥ 1,167

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- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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