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SHARE-BASED COMPENSATION - Option assumptions and Activity (Details) - Share options ¥ in Millions | 12 Months Ended
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Dec. 31, 2020 $ / shares | Dec. 31, 2020 CNY (¥) shares | Dec. 31, 2019 CNY (¥) shares | Dec. 31, 2018 CNY (¥) shares
Number of Options |  |  |  |
Share options outstanding at the beginning of the period (in shares) | shares |  | 47,632 |  |
Forfeited (in shares) | shares |  | (1,000) |  |
Exercised (in shares) | shares |  | (46,632) | (1,088,358) | (876,715)
Share options outstanding at the end of the period (in shares) | shares |  |  | 47,632 |
Weighted Average Exercise Price |  |  |  |
Share options outstanding at the beginning of the period (in dollars per shares) | $ / shares | $ 4.95 |  |  |
Forfeited (in dollars per shares) | $ / shares | 1.53 |  |  |
Exercised (in dollars per shares) | $ / shares | $ 5.03 |  |  |
Share options outstanding at the end of the period (in dollars per shares) | $ / shares |  |  |  |
Aggregate intrinsic value of options exercised | ¥ |  | ¥ 11 | ¥ 255 | ¥ 194

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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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