SHARE-BASED COMPENSATION - Share options (Details) - 6 months ended Jun. 30, 2023 - Share options ¥ / shares in Units, $ / shares in Units, ¥ in Millions, $ in Millions	USD ($) tranche $ / shares ¥ / shares shares	USD ($) tranche $ / shares shares	CNY (¥) shares
Number of Options
Granted (in shares) \| shares	28,625,350	28,625,350
Share options outstanding at the end of the period (in shares) \| shares	28,625,350	28,625,350
Share options vested or expected to vest (in shares) \| shares	26,524,250	26,524,250	26,524,250
Period for remaining percentage vested	2 years	2 years
Weighted Average Exercise Price
Granted (in dollars per shares) \| $ / shares		$ 2.80
Share options outstanding at the end of the period (in dollars per shares) \| $ / shares		2.80
Share options vested or expected to vest (in dollars per shares) \| $ / shares	$ 2.80	$ 2.80
Weighted Average Remaining Contractual Life and Aggregate Intrinsic Value
Share options outstanding, Weighted Average Remaining Contractual Life (in years)	9 years 11 months 23 days	9 years 11 months 23 days
Share options vested or expected to vest, Weighted Average Remaining Contractual Life (in years)	9 years 11 months 23 days	9 years 11 months 23 days
Aggregate Intrinsic Value
Share options outstanding, Aggregate intrinsic value \| $	$ 31	$ 31
Share options vested or expected to vest, Aggregate intrinsic value \| $	$ 29	$ 29
Total unrecognized compensation expense \| ¥			¥ 424
Weighted-average recognition period of compensation expense (in years)	3 years 11 months 23 days	3 years 11 months 23 days
Weighted-average grant date fair value \| (per share)	$ 16.06	$ 2.22
Senior officers
Aggregate Intrinsic Value
Number of tranches \| tranche	5	5
Vesting ratably over the following two years
Number of Options
Share-based payment award, vesting percentage	50.00%	50.00%
Second anniversary of the stated vesting commencement date
Number of Options
Share-based payment award, vesting percentage	50.00%	50.00%

The number of tranches.

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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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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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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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