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SHORT-TERM DEBT AND CURRENT PORTION OF LONG-TERM DEBT (Details)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Short-term borrowings      
Other short-term debt     ¥ 48,157,745
Total $ 2,507,766,699 ¥ 16,316,282,473 6,887,309,589
Restricted cash 268,785,090 1,748,796,431 1,744,490,307
Short-term investment 4,323,492,324 28,129,938,110 14,112,862,288
2020 Notes      
Short-term borrowings      
Long-term debt, current maturities 700,000,000 4,554,403,494  
2018 Notes      
Short-term borrowings      
Long-term debt, current maturities   3,076,419,373  
2017 Notes      
Short-term borrowings      
Long-term debt, current maturities     170,867,230
Loan facility      
Short-term borrowings      
Short-term bank borrowings   8,685,459,606 ¥ 6,668,284,614
Borrowing with an interest rate of 3.92%      
Short-term borrowings      
Short-term bank borrowings $ 1,300,000,000 8,700,000,000  
Bank deposits, current   2,300,000,000  
Restricted cash   595,000,000  
Short-term investment   ¥ 1,700,000,000  
Weighted average interest rate 3.92% 3.92%