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EMPLOYEE BENEFIT PLANS - Defined Contribution Plans (Details) - CNY (¥) ¥ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
EMPLOYEE BENEFIT PLANS |  |  |
Total contribution for employee benefits | ¥ 283 | ¥ 413 | ¥ 321
Contributions recognized as expense | ¥ 129 |  |

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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