The number of tranches.

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Number of options or other stock instruments adjusted for performance conditions under the terms of the plan agreements.

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No definition available.

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Weighted average price of stock options which are adjusted for performance conditions.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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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.

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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.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Percentage of vesting of award under share-based payment arrangement.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of share options (or share units) exercised during the current period.

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SHARE-BASED COMPENSATION - Share options (Details) $ / shares in Units, ¥ in Millions, $ in Millions	12 Months Ended
	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%