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TAXATION - Reconciliation of tax rate and effective tax rate (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reconciliation of the differences between statutory tax rate and effective tax rate
Statutory CIT rate	25.00%	25.00%	25.00%
Non-deductible expenses and non-taxable income incurred
Share-based compensation expenses	6.00%	(89.00%)	(38.00%)
Change in fair value of equity securities investments and exchangeable senior notes	(22.00%)	(21.00%)	0.00%
Gain on deconsolidation of a subsidiary	0.00%	0.00%	15.00%
Others	(2.00%)	1.00%	3.00%
R&D expense super deduction	(16.00%)	65.00%	0.00%
Effect of tax holiday	(7.00%)	75.00%	27.00%
Difference in tax rates of subsidiaries outside PRC	19.00%	(37.00%)	(37.00%)
Changes in valuation allowance	23.00%	(76.00%)	(24.00%)
Effective EIT rate (as a percent)	26.00%	(57.00%)	(29.00%)

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- Definition

Effective income tax rate reconciliation non deductible expense and non taxable income incurred [Abstract].

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Effective income tax rate reconciliation non taxable income gain loss on deconsolidation of a subsidiary percent.

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Effective income tax rate reconciliation nondeductible expense and non taxable income change in fair value of equity securities investment and exchangeable senior notes percent.

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Effective income tax rate reconciliation research and development.

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The portion of the difference between the domestic federal statutory income tax rate that can be explained by the different statutory rates applicable to the reporting entity's subsidiaries, including foreign rate differentials and preferential rates in certain jurisdictions.

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- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other nondeductible expenses.

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Percentage of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for share-based payment arrangement.

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