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FAIR VALUE MEASUREMENT - Roll forward of major Level 3 investments (Details) - Level 3 - CNY (¥) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Roll forward of major Level 3 investments |  |
Fair value of Level 3 investment, beginning balance | ¥ 6,805,596,210 | ¥ 5,466,103,304
Transfer in and/or out of level 3 | (1,755,271,349) | 1,587,400,415
New addition | 455,441,000 |
Disposal of investment | (16,916,380) | (317,261,674)
Effect of exchange rate change | (193,579,698) | 325,391,864
Other than temporary impairment | (155,500,570) | (36,357,902)
The change in fair value of the investment | 567,733,958 | (219,679,797)
Fair value of Level 3 investment, ending balance | ¥ 5,707,503,171 | ¥ 6,805,596,210

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- Definition Amount of other than temporary impairment 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 No definition available. + Details
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- Definition Amount of effect of exchange rate changes on 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 No definition available. + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (loss) for 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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