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INVESTMENTS - MakeMyTrip and China Eastern Airlines (Details) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2016 CNY (¥) | Jan. 31, 2016 USD ($) | Jan. 31, 2016 CNY (¥) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥)
Investment transaction disclosures |  |  |  |  |  |
Fair value of available-for-sale investment |  |  |  | ¥ 18,552,440,485 | ¥ 14,467,476,607 |
Fair value of available-for-sale investments, which are in loss position |  |  |  | 3,400,000,000 | 865,000,000 |
unrealized securities holding gain net of tax, reported in other comprehensive income |  |  |  | 305,000,000 | (7,000,000) | ¥ 108,000,000
Total cash paid for available-for-sale securities |  |  |  | 1,100,000,000 | 4,200,000,000 | ¥ 100,000,000
MakeMyTrip |  |  |  |  |  |
Investment transaction disclosures |  |  |  |  |  |
Purchase of shares, cost of share aggregate |  | $ 180 | ¥ 1,200,000,000 |  |  |
Percentage of equity interest |  | 10.00% | 10.00% |  |  |
Fair value of available-for-sale investment |  |  |  | 2,100,000,000 | 1,500,000,000 |
China Eastern Airline |  |  |  |  |  |
Investment transaction disclosures |  |  |  |  |  |
Purchase of shares, cost of share aggregate | ¥ 3,000,000,000 |  |  |  |  |
Percentage of equity interest | 3.00% |  |  |  |  |
Fair value of available-for-sale investment |  |  |  | ¥ 3,800,000,000 | ¥ 3,300,000,000 |

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