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PRINCIPAL ACTIVITIES AND ORGANIZATION - Additional Information (Details) $ / shares in Units, $ in Millions			12 Months Ended
	May 03, 2019 $ / shares shares	May 02, 2019 shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2021 CNY (¥) shares	Dec. 31, 2020 CNY (¥)
VIE's Registered Capital | ¥				¥ 33,797	¥ 33,797
ADS conversion ratio			1	1
Net proceeds from IPO			$ 109	¥ 737,000,000
American Depositary Shares [Member]
Offering of American Depositary Shares	11,000,000
Share issue price | $ / shares	$ 11.00
ADS conversion ratio	10
Exclusive Service Agreement [Member]
VIE's Agreement Term			10 years	10 years
Equity Interest Pledge Agreements [Member]
VIE's Equity Investment Percentage			100.00%	100.00%
Common Class A [Member]
Conversion of Stock, Shares Converted			895,216,752	895,216,752
Common Class A [Member] | Underwriting [Member] | American Depositary Shares [Member]
Offering of American Depositary Shares		217,447

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- Definition

The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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