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SHARE-BASED COMPENSATION - Option assumptions and Activity (Details) - Share options - CNY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Number of Options |  |  |
Exercised (in shares) | 0 | (466,320) | (10,883,580)
Aggregate intrinsic value of options exercised | ¥ 0 | ¥ 11 | ¥ 255

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