Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 8A
-URI https://asc.fasb.org/extlink&oid=124260329&loc=SL6284422-111562

Name:	us-gaap_OtherThanTemporaryImpairmentLossDebtSecuritiesAvailableForSaleRecognizedInEarnings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

PRINCIPAL ACCOUNTING POLICIES - Other income/ (expense) (Details) (Parenthetical) ¥ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022 CNY (¥)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 CNY (¥)	Dec. 31, 2020 CNY (¥)
Other income/(expenses) [Line items]
Gain from the fair value remeasurement upon the discontinuance of the equity method of the investments	¥ 1,135	$ 165
Available-for-sale debt investments impairment charges	906		¥ 0	¥ 0
Tujia and Tujia Offline \| Redeemable Preferred Stock
Other income/(expenses) [Line items]
Available-for-sale debt investments impairment charges	¥ (906)