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Business acquisition - Summary of purchase price as of the date of jiangsu five star acquisition (Detail) - Jiangsu Five Star [Member] - CNY (¥) ¥ in Millions		1 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
Summary of purchase price as of the date of acquisition [Line Items]
Conversion of loan and assuming of debt	¥ 1,025	¥ 1,025
Fair value of previously held equity interests	1,274
Total	¥ 2,299

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- Definition

Business combination conversion of loan and assuming of debt Incurred.

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- Definition

Summary of purchase price as of the date of acquisition .

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- Definition

Fair value at acquisition-date of the assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interests issued by the acquirer, including but not limited to, instruments or interests issued or issuable in consideration for the business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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- Definition

Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
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