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INVESTMENTS - Tujia (Details) - CNY (¥)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
INVESTMENTS
Gain on deconsolidation of subsidiaries		¥ 252,000	¥ 2,294,451,702
Carrying value of investments under equity method	¥ 6,068,391,137	4,114,199,782
Fair value of preferred shares under available-for-sale	6,117,238,787	¥ 6,805,596,210
Tujia
INVESTMENTS
Gain on deconsolidation of subsidiaries			¥ 2,300,000,000
Fair value of converted part of preferred shares to common shares	1,700,000,000
Carrying value of investments under equity method	1,500,000,000
Fair value of preferred shares under available-for-sale	¥ 1,700,000,000

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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The amount of the gain (loss) recognized by the parent and included in its attributable portion of net income for the period due to deconsolidation of a subsidiary or derecognition of a group of assets. The gain (loss) recognized and included in the net income attributable to the parent for the period is generally computed as the difference between: (a) the aggregate of: (1) the fair value of any consideration received; (2) the fair value of any retained noncontrolling investment in the former subsidiary at the date the subsidiary was deconsolidated; and (3) the carrying amount of any noncontrolling interest in the former subsidiary (including any accumulated other comprehensive income attributable to the noncontrolling interest) at the date the subsidiary was deconsolidated and (b) the carrying amount of the former subsidiary's assets and liabilities.

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