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PRINCIPAL ACCOUNTING POLICIES - Acquisitions (Details) £ in Billions |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2016 CNY (¥) shares | Dec. 09, 2016 GBP (£) | Dec. 09, 2016 CNY (¥) | Dec. 10, 2015 shares | Dec. 31, 2015 USD ($) | Dec. 31, 2015 CNY (¥) | Oct. 31, 2015 USD ($) Vote shares | Oct. 31, 2015 CNY (¥) Vote shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2017 CNY (¥) shares | Dec. 31, 2016 GBP (£) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 CNY (¥) shares | Dec. 31, 2015 CNY (¥)
Business combination disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares outstanding | shares | 64,155,412 |  |  |  |  |  |  |  | 67,600,654 | 67,600,654 |  |  | 64,155,412 |
Purchase price allocation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease in the non-controlling interest's ownership |  |  |  |  |  |  |  |  |  | ¥ 2,311,932,774 |  |  | ¥ 6,532,152,666 | ¥ 46,236,902
Skyscanner |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase consideration |  | £ 1.4 | ¥ 12,000,000,000 |  |  |  |  |  |  |  |  |  |  |
Acquisition consideration in cash |  |  |  |  |  |  |  |  |  |  | £ 1.2 |  | 10,000,000,000 |
Cash portion of the total purchase consideration agreed |  |  | 10,100,000,000 |  |  |  |  |  |  |  |  |  |  |
Increase in consideration as measurement period adjustment |  |  | 60,000,000 |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net assets | ¥ 325,000,000 |  |  |  |  |  |  |  |  |  |  |  | 325,000,000 |
Cash acquired |  |  | 571,000,000 |  |  |  |  |  |  |  |  |  |  |
Non-controlling interests | 316,000,000 |  |  |  |  |  |  |  |  |  |  |  | 316,000,000 |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  | 9,583,716,450 |
Identifiable intangible assets | 3,100,000,000 |  |  |  |  |  |  |  |  |  |  |  | 3,100,000,000 |
Deferred tax liabilities |  |  | 620,000,000 |  |  |  |  |  |  |  |  |  |  |
Qunar |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase consideration |  |  |  |  | $ 5,103,252,544 | ¥ 32,541,365,375 |  |  |  |  |  |  |  |
Equity interest (as a percent) |  |  |  |  |  |  | 45.00% | 45.00% |  |  |  |  |  |
Ownership of share capital held (as a percent) |  |  |  |  |  |  | 48.00% | 48.00% |  |  |  |  |  |
Purchase price allocation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net liabilities | 628,000,000 |  |  |  |  |  |  |  |  |  |  |  | 628,000,000 |
Non-controlling interests | 17,900,000,000 |  |  |  |  |  |  |  |  |  |  |  | 17,900,000,000 |
Goodwill | 43,600,000,000 |  |  |  |  |  |  |  |  |  |  |  | 582,240,644 |
Identifiable intangible assets | 9,900,000,000 |  |  |  |  |  |  |  |  |  |  |  | 9,900,000,000 |
Cash and cash equivalents | 5,200,000,000 |  |  |  |  |  |  |  |  |  |  |  | 5,200,000,000 |
Non-current assets | 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  | 1,000,000,000 |
Short term debts | 3,900,000,000 |  |  |  |  |  |  |  |  |  |  |  | 3,900,000,000 |
Other current liabilities | 7,100,000,000 |  |  |  |  |  |  |  |  |  |  |  | 7,100,000,000 |
Non-current liability | 93,000,000 |  |  |  |  |  |  |  |  |  |  |  | 93,000,000 |
Prepayments and other current assets | 4,300,000,000 |  |  |  |  |  |  |  |  |  |  |  | 4,300,000,000 |
Deferred tax liabilities | 2,500,000,000 |  |  |  |  |  |  |  |  |  |  |  | 2,500,000,000 |
Decrease in the non-controlling interest's ownership |  |  |  |  |  |  |  |  |  | 2,200,000,000 |  |  | 15,500,000,000 |
Additional paid-in capital from the newly issued ordinary shares |  |  |  |  |  |  |  |  |  | 600,000,000 |  |  | 3,700,000,000 |
Pro forma results |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro-forma net revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,812,533,000
Pro-forma net loss |  |  |  |  |  |  |  |  |  |  |  |  |  | (5,086,934,000)
Qunar | Trademark and domain |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets | 9,000,000,000 |  |  |  |  |  |  |  |  |  |  |  | 9,000,000,000 |
Qunar | Technology and supplier network for new products |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average useful life |  |  |  |  | 5 years 2 months 12 days | 5 years 2 months 12 days |  |  |  |  |  |  |  |
Qunar | Baidu |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase consideration |  |  |  |  | $ 3,416,184,974 | ¥ 21,698,582,100 |  |  |  |  |  |  |  |
Shares issued as consideration (in shares) | shares |  |  |  |  |  |  | 11,000,000 | 11,000,000 |  |  |  |  |  |
Fair value of shares issued as consideration |  |  |  |  |  |  | $ 3,400,000,000 | ¥ 21,700,000,000 |  |  |  |  |  |
Shares issued for the benefit of employees | shares |  |  |  | 4,000,000 |  |  |  |  |  |  |  |  |  |
Qunar | Qunar Employees |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase consideration |  |  |  |  | $ 1,687,067,570 | ¥ 10,842,783,275 |  |  |  |  |  |  |  |
Qunar | Common Class A |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares acquired | shares |  |  |  |  |  |  | 179,000,000 | 179,000,000 |  |  |  |  |  |
Shares outstanding | shares |  |  |  |  |  |  | 193,000,000 | 193,000,000 |  |  |  |  |  |
Number of votes per share | Vote |  |  |  |  |  |  | 3 | 3 |  |  |  |  |  |
Qunar | Common Class B |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares acquired | shares |  |  |  |  |  |  | 11,000,000 | 11,000,000 |  |  |  |  |  |
Number of votes per share | Vote |  |  |  |  |  |  | 1 | 1 |  |  |  |  |  |
Number of shares exchanged for shares issued to employees | shares |  |  |  | 66,000,000 |  |  |  |  |  |  |  |  |  |
Number of shares deemed to be owned | shares |  |  |  |  |  |  | 256,000,000 | 256,000,000 |  |  |  |  |  |
Others |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase consideration |  |  |  |  |  |  |  |  |  | 251,000,000 |  |  | 120,000,000 | 862,000,000
Purchase price allocation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in goodwill as measurement period adjustment |  |  |  |  |  |  |  |  |  | ¥ 291,000,000 |  |  | 159,000,000 | ¥ 817,000,000
Certain investments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase consideration | $ |  |  |  |  |  |  |  |  | $ 400,000,000 |  |  | $ 2,900,000,000 |  |
Supplier relationship | Skyscanner |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  | ¥ 929,000,000 |  |  |  |  |  |  |  |  |  |  |
Intangible asset useful life |  | 9 years | 9 years |  |  |  |  |  |  |  |  |  |  |
IT Platform | Skyscanner |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  | ¥ 191,000,000 |  |  |  |  |  |  |  |  |  |  |
Intangible asset useful life |  | 6 years | 6 years |  |  |  |  |  |  |  |  |  |  |
Technology and supplier network for new products | Qunar |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets | ¥ 900,000,000 |  |  |  |  |  |  |  |  |  |  |  | ¥ 900,000,000 |

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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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