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SHARE-BASED COMPENSATION - Share options (Details) $ / shares in Units, ¥ in Millions, $ in Millions | 12 Months Ended |
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Dec. 31, 2025 USD ($) $ / shares shares | Dec. 31, 2025 CNY (¥) tranche shares | Dec. 31, 2024 CNY (¥) shares | Dec. 31, 2023 CNY (¥) tranche shares | Dec. 31, 2025 CNY (¥) shares
Number of Options |  |  |  |  |
Share options outstanding at the beginning of the period (in shares) | shares |  | 28,019,660 |  |  |
Granted (in shares) | shares |  | 888,210 |  |  |
Forfeited (in shares) | shares |  | (2,410,610) |  |  |
Exercised (in shares) | shares |  | (1,911,860) |  |  |
Adjusted for performance conditions (in shares) | shares |  | (179,370) |  |  |
Share options outstanding at the end of the period (in shares) | shares |  | 24,406,030 | 28,019,660 |  |
Share options vested or expected to vest (in shares) | shares | 22,471,610 |  |  |  | 22,471,610
Share options exercisable (in shares) | shares | 1,716,960 |  |  |  | 1,716,960
Weighted Average Exercise Price |  |  |  |  |
Share options outstanding at the beginning of the period (in dollars per shares) | $ / shares | $ 2.8 |  |  |  |
Granted (in dollars per shares) | $ / shares | 2.8 |  |  |  |
Forfeited (in dollars per shares) | $ / shares | 2.8 |  |  |  |
Exercised (in dollars per shares) | $ / shares | 2.8 |  |  |  |
Adjusted for performance conditions (in dollars per shares) | $ / shares | 2.8 |  |  |  |
Share options outstanding at the end of the period (in dollars per shares) | $ / shares | 2.8 |  |  |  |
Share options vested or expected to vest (in dollars per shares) | $ / shares | 2.8 |  |  |  |
Share options exercisable (in dollars per shares) | $ / shares | $ 2.8 |  |  |  |
Weighted Average Remaining Contractual Life and Aggregate Intrinsic Value |  |  |  |  |
Share options outstanding, Weighted Average Remaining Contractual Life (in years) |  | 7 years 4 months 24 days |  |  |
Share options vested or expected to vest, Weighted Average Remaining Contractual Life (in years) |  | 7 years 4 months 24 days |  |  |
Share options exercisable, Weighted Average Remaining Contractual Life (in years) |  | 7 years 4 months 28 days |  |  |
Aggregate Intrinsic Value |  |  |  |  |
Share options outstanding, Aggregate intrinsic value | $ | $ 46 |  |  |  |
Share options vested or expected to vest, Aggregate intrinsic value | $ | 43 |  |  |  |
Share options exercisable, Aggregate intrinsic value | $ | $ 3 |  |  |  |
Recognized share-based compensation expenses | ¥ |  | ¥ 420 | ¥ 322 | ¥ 143 |
Aggregate intrinsic value of options exercised | ¥ |  | ¥ 15 |  |  |
Employee Stock Option |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |
Weighted-average grant date fair value | $ / shares | $ 1.34 |  |  |  |
Total unrecognized compensation expense | ¥ |  |  |  |  | ¥ 111
Weighted-average recognition period of compensation expense (in years) |  | 2 years 6 months 21 days |  |  |
Share options |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |
Recognized share-based compensation expenses | ¥ |  | ¥ 172 |  |  |
Senior officers | Employee Stock Option |  |  |  |  |
Number of Options |  |  |  |  |
Granted (in shares) | shares |  | 888,210 |  | 28,625,350 |
Aggregate Intrinsic Value |  |  |  |  |
Number of tranches | tranche |  | 3 |  | 5 |
Period for remaining percentage vested |  | 2 years |  | 2 years |
Second anniversary of the stated vesting commencement date | Senior officers | Employee Stock Option |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |
Share-based payment award, vesting percentage |  | 50.00% |  | 50.00% |
Vesting ratably over the following two years | Senior officers | Employee Stock Option |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |
Share-based payment award, vesting percentage |  | 50.00% |  | 50.00% |

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