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INVESTMENTS - Available-for-sale investments (Details) - CNY (¥) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Available-for-sale investments, Cost |  |
Listed equity securities, Cost, after adjusted with other-than-temporary impairment | ¥ 6,135,979,970 | ¥ 5,642,265,038
Unlisted debt securities, Cost, after adjusted with other-than-temporary impairment | 5,362,010,027 | 6,263,538,336
Total Available-for-sale investments, Cost, after adjusted with other-than-temporary impairment | 11,497,989,997 | 11,905,803,374
Available-for-sale investments, Gross Unrealized Gains |  |
Listed equity securities, Gross Unrealized Gains, including forex adjustment | 6,299,221,728 | 2,116,672,845
Unlisted debt securities, Gross Unrealized Gains, including forex adjustment | 909,212,411 | 572,369,972
Total Available-for-sale investments, Gross Unrealized Gains, including forex adjustment | 7,208,434,139 | 2,689,042,817
Available-for-sale investments, Gross Unrealized Losses |  |
Listed equity securities, Gross Unrealized Losses, including forex adjustment |  | (97,057,486)
Unlisted debt securities, Gross Unrealized Losses, including forex adjustment | (153,983,651) | (30,312,098)
Total Available-for-sale investments, Gross Unrealized Losses, including forex adjustment | (153,983,651) | (127,369,584)
Available-for-sale investments, Fair Value |  |
Listed equity securities, Fair Value | 12,435,201,698 | 7,661,880,397
Unlisted debt securities, Fair Value | 6,117,238,787 | 6,805,596,210
Total Available-for-sale investments, Fair Value | ¥ 18,552,440,485 | ¥ 14,467,476,607

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- Definition Amount of unrealized gain before deducting unrealized loss on investments in debt securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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