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RELATED PARTY TRANSACTIONS AND BALANCES (Details) ¥ in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2024 CNY (¥)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 CNY (¥)	Dec. 31, 2023 CNY (¥)
RELATED PARTY TRANSACTIONS AND BALANCES
Other Receivable, after Allowance for Credit Loss, Related Party [Extensible Enumeration]	srt:AffiliatedEntityMember			srt:AffiliatedEntityMember
Total revenues	¥ 11,426	$ 1,572	¥ 10,010
Related party
RELATED PARTY TRANSACTIONS AND BALANCES
Allowance for expected credit losses	(62)			¥ (63)
Total	279			235
Due to related party	119			77
Related party \| Trip.com
RELATED PARTY TRANSACTIONS AND BALANCES
Amounts due from related parties	213			174
Due to related party	86			48
Related party \| Trip.com \| Commission expenses
RELATED PARTY TRANSACTIONS AND BALANCES
Expenses with related parties	150		102
Related party \| Trip.com \| Lease expenses
RELATED PARTY TRANSACTIONS AND BALANCES
Expenses with related parties	10		9
Related party \| Trip.com \| Service fee
RELATED PARTY TRANSACTIONS AND BALANCES
Total revenues	68		9
Related party \| Lianquan
RELATED PARTY TRANSACTIONS AND BALANCES
Amounts due from related parties	44			45
Related party \| Lianquan \| Sublease income
RELATED PARTY TRANSACTIONS AND BALANCES
Total revenues	6		4
Related party \| Huamai
RELATED PARTY TRANSACTIONS AND BALANCES
Amounts due from related parties	19			22
Related party \| Zhuchuang
RELATED PARTY TRANSACTIONS AND BALANCES
Amounts due from related parties	14			14
Related party \| Others
RELATED PARTY TRANSACTIONS AND BALANCES
Amounts due from related parties	41			34
Due to related party	20			13
Related party \| Cjia Group
RELATED PARTY TRANSACTIONS AND BALANCES
Amounts due from related parties	10			9
Due to related party	13			¥ 16
Related party \| Cjia Group \| Lease expenses
RELATED PARTY TRANSACTIONS AND BALANCES
Expenses with related parties	18		17
Related party \| Cjia Group \| Goods sold and service provided
RELATED PARTY TRANSACTIONS AND BALANCES
Total revenues	11		4
Related party \| Cjia Group \| Sublease income
RELATED PARTY TRANSACTIONS AND BALANCES
Total revenues	3		2
Related party \| Sheen Star \| Service fee
RELATED PARTY TRANSACTIONS AND BALANCES
Total revenues			3
Related party \| Azure \| Service fee
RELATED PARTY TRANSACTIONS AND BALANCES
Total revenues	¥ 11		¥ 7