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GOODWILL | 12 Months Ended
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Dec. 31, 2017
GOODWILL |
GOODWILL | 10. GOODWILL Goodwill, which is not tax deductible, represents the synergy effects of the business combinations. The changes in the carrying amount of goodwill for the years ended December 31, 2016 and 2017 were as follows:
|  | 2016 |  | 2017 |
|  | RMB |  | RMB |
Balance at beginning of year |  | 45,690,440,903 |  | 56,015,185,590 |
Acquisition of Skyscanner (Note 2) |  | 9,583,716,450 |  | (59,685,731 | )
Acquisition of Qunar (Note 2) |  | 582,240,644 |  | — |
Others |  | 158,787,593 |  | 290,551,433 |
Balance at end of period. |  | 56,015,185,590 |  | 56,246,051,292 |
Goodwill resulting from the business combinations completed in the years ended December 31, 2017 has been allocated to the single reporting unit of the Group. For the years ended December 31, 2015, 2016 and 2017, the Company did not have goodwill impairment. As of December 31, 2017, there had not been any accumulated goodwill impairment provided.

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- Definition The entire disclosure for goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2144439 + Details
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