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INVESTMENTS - Unaudited condensed financial information of equity investments (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥)
Investment transaction disclosures |  |  |  |
Carrying value of investments under equity method |  | ¥ 6,068,391,137 | ¥ 4,114,199,782 |
Operating data: |  |  |  |
Equity in income / (loss) of affiliates | $ (10,008,156) | (65,116,066) | 601,883,179 | ¥ (135,780,312)
Balance sheet data: |  |  |  |
Total cash paid for equity method investments |  | 200,000,000 | 1,000,000,000 | 2,900,000,000
Investment funds |  |  |  |
Investment transaction disclosures |  |  |  |
Carrying value of investments under equity method |  | 780,000,000 | 616,000,000 |
Qunar |  |  |  |
Operating data: |  |  |  |
Revenue |  |  |  | 841,814,520
Gross profit |  |  |  | 537,240,212
Income/(loss) from operations |  |  |  | (4,792,664,736)
Net loss |  |  |  | (4,917,200,749)
Net loss attributable to our equity method investments companies |  |  |  | (2,352,388,839)
Add: Gain from disposal of equity investments, including the remeasurement gain/(loss) from previously held equity investments in step acquisitions |  |  |  | 2,352,388,839
Balance sheet data: |  |  |  |
Current assets |  |  |  | 9,433,080,372
Long-term assets |  |  |  | 1,072,464,782
Current liabilities |  |  |  | 10,442,341,153
Long-term liabilities |  |  |  | 93,019,969
Non-controlling interests |  |  |  | 5,282,358
Other equity investments |  |  |  |
Operating data: |  |  |  |
Revenue |  |  | 5,917,850,003 | 7,069,224,177
Gross profit |  |  | 4,785,282,088 | 1,581,396,551
Income/(loss) from operations |  |  | 155,471,096 | (20,961,158)
Net loss |  |  | (62,190,299) | (189,461,030)
Net loss attributable to our equity method investments companies |  |  | (55,314,772) | (127,465,948)
Add: Equity dilution impact |  |  | 11,027,933 | (8,314,364)
Add: Gain from disposal of equity investments, including the remeasurement gain/(loss) from previously held equity investments in step acquisitions |  |  | 1,369,310,070 |
Equity in income / (loss) of affiliates |  |  | 1,325,023,231 | (135,780,312)
Balance sheet data: |  |  |  |
Current assets |  |  | 3,353,714,017 | 4,091,410,052
Long-term assets |  |  | 17,298,415,142 | 10,102,034,376
Current liabilities |  |  | 11,595,906,780 | 4,043,523,264
Long-term liabilities |  |  | 1,650,938,946 | 466,730,372
Non-controlling interests |  |  | 1,944,540,518 | ¥ 76,928,317
eLong |  |  |  |
Operating data: |  |  |  |
Revenue |  |  | 1,895,409,404 |
Gross profit |  |  | 997,644,227 |
Income/(loss) from operations |  |  | (1,312,847,794) |
Net loss |  |  | (1,635,384,928) |
Net loss attributable to our equity method investments companies |  |  | (722,307,716) |
Add: Equity dilution impact |  |  | (832,336) |
Equity in income / (loss) of affiliates |  |  | (723,140,052) |
Balance sheet data: |  |  |  |
Current assets |  |  | 1,978,681,514 |
Long-term assets |  |  | 454,710,971 |
Current liabilities |  |  | 1,687,293,575 |
Long-term liabilities |  |  | 15,970,032 |
Non-controlling interests |  |  | ¥ 15,512,748 |
Equity investments |  |  |  |
Operating data: |  |  |  |
Revenue |  | 14,242,886,080 |  |
Gross profit |  | 8,145,081,600 |  |
Income/(loss) from operations |  | 80,460,912 |  |
Net loss |  | (222,770,078) |  |
Net loss attributable to our equity method investments companies |  | (78,644,006) |  |
Add: Equity dilution impact |  | 13,527,940 |  |
Equity in income / (loss) of affiliates |  | (65,116,066) |  |
Balance sheet data: |  |  |  |
Current assets |  | 9,836,444,371 |  |
Long-term assets |  | 16,552,821,327 |  |
Current liabilities |  | 8,061,346,134 |  |
Long-term liabilities |  | 6,191,180,525 |  |
Non-controlling interests |  | ¥ 323,853,090 |  |

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- Definition The amount of current assets reported by an equity method investment of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33912-111571 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721683-107760 + Details
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- Definition The amount of current liabilities reported by an equity method investment of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33912-111571 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721683-107760 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612 + Details
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- Definition The amount of gross profit (loss) reported by an equity method investment of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721683-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33912-111571 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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- Definition Amount of equity attributable to noncontrolling interests of an equity method investment of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721683-107760 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33912-111571 + Details
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- Definition The amount of net income (loss) reported by an equity method investment of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721683-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33912-111571 + Details
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- Definition The amount of revenue from sale of goods and services reduced by sales returns, allowances, and discounts reported by an equity method investment of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721683-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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