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LONG-TERM DEBT (Details) |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 19, 2016 USD ($) $ / shares | Jun. 18, 2015 USD ($) $ / shares shares | Oct. 17, 2013 USD ($) $ / shares shares | Sep. 24, 2012 USD ($) $ / shares shares | Jun. 30, 2017 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2017 CNY (¥) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2016 CNY (¥) shares | Dec. 31, 2015 CNY (¥) | Dec. 31, 2017 CNY (¥) | Sep. 12, 2016 USD ($) $ / shares | Dec. 10, 2015 USD ($) item $ / shares | May 26, 2015 USD ($) $ / shares | Aug. 07, 2014 USD ($) $ / shares
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term loan | ¥ |  |  |  |  |  |  |  |  | ¥ 2,550,000,000 |  | ¥ 8,807,156,482 |  |  |  |
Less: Debt issuance costs | ¥ |  |  |  |  |  |  |  |  | (184,276,447) |  | (81,746,715) |  |  |  |
Total |  |  |  |  |  | $ 4,491,070,926 |  |  | 34,650,673,553 |  | 29,220,254,767 |  |  |  |
Fair value of long-term debt, based on Level 2 inputs |  |  |  |  |  | 29,300,000,000 |  |  |  |  |  |  |  |  |
Proceeds from sale of warrants | ¥ |  |  |  |  |  |  |  |  |  | ¥ 523,404,000 |  |  |  |  |
Notes for early conversion |  |  |  |  |  | 368,221,572 | ¥ 2,395,760,015 |  | 2,604,871,611 | ¥ 118,973,721 |  |  |  |  |
Proceeds from the termination of 2012 and 2013 Purchased Call Option |  |  |  |  |  | 100,000,000 | ¥ 650,000,000 | $ 12,000,000 |  |  |  |  |  |  |
Borrowings collateralized by stock at a wholly-owned subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  | $ 1,400,000,000 |  |  |  |  | ¥ 8,800,000,000 |  |  |  |
Borrowings collateralized by stock at a wholly-owned subsidiary | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 1.90% |  |  |  |  | 1.90% |  |  |  |
Borrowings collateralized by stock at a wholly-owned subsidiary | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 7.00% |  |  |  |  | 7.00% |  |  |  |
2018 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term loan | ¥ |  |  |  |  |  |  |  |  | 5,554,400,000 |  |  |  |  |  |
Interest rate (as a percent) |  |  | 1.25% |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 800,000,000 |  | $ 327,000,000 |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  | $ 19,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Notes for early conversion |  |  |  |  |  | $ 352,000,000 |  |  |  |  |  |  |  |  |
2018 Notes | ADS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial conversion rate |  |  | 0.0127568 |  |  |  |  |  |  |  |  |  |  |  |
Initial conversion price (in dollars per share) | $ / shares |  |  | $ 78.39 |  | $ 39.19 |  |  |  |  |  |  |  |  |  |
Number of shares agreed to be sold by the counterparty on exercise of Purchased Call option | shares |  |  |  |  | 8,300,000 |  |  |  |  |  |  |  |  |  |
Number of shares issued upon exchange of notes | shares |  |  |  |  |  | 10.8 | 10.8 |  |  |  |  |  |  |  |
2018 Notes | ADS | Purchased Call Option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price agreed to be sold by the counterparty on exercise of Purchased call option | $ / shares |  |  | $ 78.39 |  |  |  |  |  |  |  |  |  |  |  |
2018 Notes | ADS | Purchased Call Option | Long | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares agreed to be sold by the counterparty on exercise of Purchased Call option | shares |  |  | 10,200,000 |  |  |  |  |  |  |  |  |  |  |  |
2018 Notes | ADS | Sold Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of warrants |  |  | $ 77,200,000 |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants sold (in dollars per share) | $ / shares |  |  | $ 96.27 |  |  |  |  |  |  |  |  |  |  |  |
2018 Notes | ADS | Sold Warrants | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares that can be purchased from warrants sold | shares |  |  | 10,200,000 |  |  |  |  |  |  |  |  |  |  |  |
2020 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term loan | ¥ |  |  |  |  |  |  |  |  | 4,860,100,000 |  |  |  |  |  |
Interest rate (as a percent) |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Initial conversion rate |  | 0.0091942 |  |  |  |  |  |  |  |  |  |  |  |  |
2020 Notes | ADS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial conversion price (in dollars per share) | $ / shares |  | $ 108.76 |  |  |  |  |  |  |  |  |  |  |  |  |
2025 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term loan | ¥ |  |  |  |  |  |  |  |  | 2,777,200,000 |  | ¥ 2,602,520,000 |  |  |  |
Interest rate (as a percent) |  | 1.99% |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  | $ 400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  | $ 6,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Initial conversion rate |  | 0.0093555 |  |  |  |  |  |  |  |  |  |  |  |  |
2025 Notes | ADS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial conversion price (in dollars per share) | $ / shares |  | $ 106.89 |  |  |  |  |  |  |  |  |  |  |  |  |
2022 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term loan | ¥ |  |  |  |  |  |  |  |  | 6,769,425,000 |  | 6,343,642,500 |  |  |  |
Interest rate (as a percent) | 1.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial conversion rate | 0.0152688 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2022 Notes | ADS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial conversion price (in dollars per share) | $ / shares | $ 65.49 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 Priceline Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term loan | ¥ |  |  |  |  |  |  |  |  | 3,471,500,000 |  | 3,253,150,000 |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00%
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000
2019 Priceline Note | ADS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial conversion price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 81.36
2020 Priceline Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term loan | ¥ |  |  |  |  |  |  |  |  | 1,735,750,000 |  | 1,626,575,000 |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |
Aggregate principal amount |  | $ 700,000,000 |  |  |  |  |  |  |  |  |  |  |  | $ 250,000,000 |
Debt issuance costs |  | $ 11,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
2020 Priceline Notes | ADS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial conversion price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 104.27 |
Number of shares that can be purchased from warrants sold | shares |  | 6,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |
2020 Priceline Notes | ADS | Sold Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of warrants |  | $ 84,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares that can be purchased from warrants sold | shares |  | 6,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |
2025 Priceline and Hillhouse Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term loan | ¥ |  |  |  |  |  |  |  |  | 6,943,000,000 |  | 6,506,300,000 |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |
2025 Priceline and Hillhouse Notes | ADS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial conversion price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 68.46 |  |
2022 Priceline Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term loan | ¥ |  |  |  |  |  |  |  |  | ¥ 173,575,000 |  | ¥ 162,657,500 |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 1.25% |  |  |
2022 Priceline Notes | ADS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial conversion price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 65.49 |  |  |
2022 Priceline Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ 975,000,000 |  |  |  |  |  |  |  |  |  |  | $ 25,000,000 |  |  |
Debt issuance costs | $ 19,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  | $ 180,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  | $ 5,400,000 |  |  |  |  |  |  |  |  |  |  |
Notes for early conversion |  |  |  |  |  |  |  | $ 26,000,000 |  |  |  |  |  |  |
2017 Notes | ADS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial conversion rate |  |  |  | 0.0517116 |  |  |  |  |  |  |  |  |  |  |
Initial conversion price (in dollars per share) | $ / shares |  |  |  | $ 19.34 |  |  |  |  |  |  |  |  |  |  |
Number of shares issued upon exchange of notes | shares |  |  |  |  |  |  |  | 2.6 | 2.6 |  |  |  |  |  |
2017 Notes | ADS | Purchased Call Option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price agreed to be sold by the counterparty on exercise of Purchased call option | $ / shares |  |  |  | $ 19.34 |  |  |  |  |  |  |  |  |  |  |
2017 Notes | ADS | Purchased Call Option | Long | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares agreed to be sold by the counterparty on exercise of Purchased Call option | shares |  |  |  | 9,300,000 |  |  |  |  |  |  |  |  |  |  |
2017 Notes | ADS | Sold Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of warrants |  |  |  | $ 26,600,000 |  |  |  |  |  |  |  |  |  |  |
Number of shares that can be purchased from warrants sold | shares |  |  |  | 9,300,000 |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants sold (in dollars per share) | $ / shares |  |  |  | $ 26.37 |  |  |  |  |  |  |  |  |  |  |
Priceline and Hillhouse Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |  |
Number of affiliates | item |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |

X
- Definition Amount of long-term debt, excluding current maturities and including debt issuance cost. + References No definition available. + Details
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- Definition Represents the number of shares agreed to be sold by the counterparty on exercise of Purchased Call option. + References No definition available. + Details
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