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INVESTMENTS - Equity securities without readily determinable fair values (Details) ¥ in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 CNY (¥) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 CNY (¥)
Summary of Investment Holdings [Line Items] |  |  |  |
Equity securities without readily determinable fair values | ¥ 182 |  | ¥ 257 |
Investment income recognized | 806 | $ 113 | (321) | ¥ 188
Cjia/Cjia Group |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Equity securities without readily determinable fair values | 99 |  | 138 |
Oravel Stays Private limited ("OYO") |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Equity securities without readily determinable fair values | ¥ 54 |  | 54 |
Accor Hotels ("Accor") |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Impairment of equity securities with out readily determinable fair value |  |  | ¥ 358 |

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- Definition Amount of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479536/321-10-50-3 + Details
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- Definition Amount of impairment loss on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479536/321-10-50-3 + Details
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- Definition Amount of realized and unrealized gain (loss) on investment. + References Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
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