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RELATED PARTY TRANSACTIONS AND BALANCES (Details) ¥ in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2023 CNY (¥)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 CNY (¥)	Dec. 31, 2022 CNY (¥)
RELATED PARTY TRANSACTIONS AND BALANCES
Total revenues	¥ 10,010	$ 1,380	¥ 6,063
Other Receivable, after Allowance for Credit Loss, Related Party, Type [Extensible Enumeration]	Affiliated Entity [Member]			Affiliated Entity [Member]
Related party
RELATED PARTY TRANSACTIONS AND BALANCES
Due to related party	¥ 89			¥ 71
Allowance for expected credit losses	(52)			(37)
Total	147			184
Related party \| Sheen Star
RELATED PARTY TRANSACTIONS AND BALANCES
Amounts due from related parties	27			29
Related party \| Sheen Star \| Service fee
RELATED PARTY TRANSACTIONS AND BALANCES
Total revenues	3		1
Related party \| Zhuchuang
RELATED PARTY TRANSACTIONS AND BALANCES
Amounts due from related parties	19			24
Related party \| Trip.com
RELATED PARTY TRANSACTIONS AND BALANCES
Amounts due from related parties	51			73
Due to related party	44			38
Related party \| Trip.com \| Commission expenses
RELATED PARTY TRANSACTIONS AND BALANCES
Expenses with related parties	102		20
Related party \| Trip.com \| Lease expenses
RELATED PARTY TRANSACTIONS AND BALANCES
Expenses with related parties	9		9
Related party \| Trip.com \| Service fee
RELATED PARTY TRANSACTIONS AND BALANCES
Total revenues	9		20
Related party \| Cjia/Cjia Group
RELATED PARTY TRANSACTIONS AND BALANCES
Amounts due from related parties	37			28
Due to related party	30			26
Related party \| Cjia/Cjia Group \| Lease expenses
RELATED PARTY TRANSACTIONS AND BALANCES
Expenses with related parties	17		18
Related party \| Cjia/Cjia Group \| Goods sold and service provided
RELATED PARTY TRANSACTIONS AND BALANCES
Total revenues	4		2
Related party \| Cjia/Cjia Group \| Sublease income
RELATED PARTY TRANSACTIONS AND BALANCES
Total revenues	2		3
Related party \| Lianquan
RELATED PARTY TRANSACTIONS AND BALANCES
Amounts due from related parties	45			46
Related party \| Lianquan \| Sublease income
RELATED PARTY TRANSACTIONS AND BALANCES
Total revenues	4		6
Related party \| Others
RELATED PARTY TRANSACTIONS AND BALANCES
Amounts due from related parties	20			21
Due to related party	15			¥ 7
Related party \| AZURE \| Service fee
RELATED PARTY TRANSACTIONS AND BALANCES
Total revenues	¥ 7		¥ 1