SHARE-BASED COMPENSATION - Share options (Details) $ / shares in Units, ¥ in Millions, $ in Millions	12 Months Ended
Dec. 31, 2023 USD ($) tranche $ / shares shares	Dec. 31, 2023 CNY (¥) shares
Weighted Average Exercise Price
Adjusted for performance conditions (in dollars per shares)	$ 2.80
Share options
Number of Options
Granted (in shares) \| shares	28,625,350
Adjusted for performance conditions (in shares) \| shares	(106,250)
Share options outstanding at the end of the period (in shares) \| shares	28,519,100
Share options vested or expected to vest (in shares) \| shares	26,429,100	26,429,100
Weighted Average Exercise Price
Granted (in dollars per shares)	$ 2.80
Share options outstanding at the end of the period (in dollars per shares)	2.80
Share options vested or expected to vest (in dollars per shares)	$ 2.80
Weighted Average Remaining Contractual Life and Aggregate Intrinsic Value
Share options outstanding, Weighted Average Remaining Contractual Life (in years)	9 years 4 months 28 days
Share options vested or expected to vest, Weighted Average Remaining Contractual Life (in years)	9 years 4 months 28 days
Aggregate Intrinsic Value
Share options outstanding, Aggregate intrinsic value \| $	$ 16
Share options vested or expected to vest, Aggregate intrinsic value \| $	$ 14
Number of tranches \| tranche	5
Total unrecognized compensation expense \| ¥		¥ 68
Weighted-average recognition period of compensation expense (in years)	3 years 4 months 28 days
Weighted-average grant date fair value	$ 2.22
Vesting on the second anniversary \| Share options
Aggregate Intrinsic Value
Share-based payment award, vesting percentage	50.00%
Vesting ratably over the following two years \| Share options
Aggregate Intrinsic Value
Share-based payment award, vesting percentage	50.00%
Period for remaining percentage vested	2 years

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

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- Definition

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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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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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 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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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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