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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Fair value (Details) ¥ in Thousands, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 CNY (¥) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2021 USD ($)
Fair value |  |  |  |
Equity securities with readily determinable fair value | ¥ 2,589,000 | ¥ 3,903,000 |  | $ 406
Retirement benefit obligation | 144,000 | 179,000 |  | 23
Property and equipment - Total Loss for the Year | 157,000 | 180,000 | ¥ 3,000 |
Operating lease right-of-use assets | 29,942,000 | 28,980,000 |  | 4,698
Goodwill | 5,132,000 | 4,988,000 | 2,657,000 | $ 805
Intangible assets carrying value | 2,801 | 0 | 0 |
Impairment charge of intangible assets | 245,000 | 0 | 0 |
Goodwill, Impairment Loss | 0 | 437,000 | 0 |
Property and equipment, impairment loss | 24,000 | 41,000 |  |
Long-term investment, impairment loss | 63,000 | 92,000 | 10,000 |
Operating lease right-of-use assets, impairment loss | 48,000 | 139,000 |  |
Long-lived asset impairment loss | 157,000 | 180,000 | 3,000 |
Operating lease, impairment loss | 48,000 | 139,000 | 0 |
Leased hotels |  |  |  |
Fair value |  |  |  |
Property and equipment - Total Loss for the Year | 24,000 |  | 3,000 |
Property and equipment, impairment loss |  | 41,000 |  |
Long-lived asset impairment loss | 24,000 |  | 3,000 |
Convertible senior notes |  |  |  |
Fair value |  |  |  |
Long-term bank borrowings, current portion | 3,029,000 |  |  |
Carrying amounts of convertible senior notes | 6,186,000 | 6,318,000 | 3,290,000 |
Fair value of convertible senior notes | 6,681,000 | 7,747,000 | ¥ 3,711,000 |
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Fair value |  |  |  |
Equity securities with readily determinable fair value | 2,589,000 | 3,903,000 |  |
Retirement benefit obligation | 5,000 | 6,000 |  |
Recurring basis | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair value |  |  |  |
Available-for-sale debt securities | 220,000 | 220,000 |  |
Non-recurring basis |  |  |  |
Fair value |  |  |  |
Property and equipment | 33,000 | 2,000 |  |
Intangible assets | 2,556,000 |  |  |
Operating lease right-of-use assets | 88,000 | 71,000 |  |
Goodwill |  | 2,328,000 |  |
Non-recurring basis | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value |  |  |  |
Property and equipment | 33,000 | 2,000 |  |
Intangible assets | 2,556,000 |  |  |
Operating lease right-of-use assets | ¥ 88,000 | 71,000 |  |
Goodwill |  | ¥ 2,328,000 |  |
Revenue growth rate | Minimum |  |  |  |
Fair value |  |  |  |
Measurement input | (15) | (15) | (15) | (15)
Revenue growth rate | Maximum |  |  |  |
Fair value |  |  |  |
Measurement input | 4 | 4 | 4 | 4
Discount rate | Minimum |  |  |  |
Fair value |  |  |  |
Measurement input | 8.64 | 8.64 | 8.64 | 8.64
Discount rate | Maximum |  |  |  |
Fair value |  |  |  |
Measurement input | 20 | 20 | 20 | 20
Fair value | Recurring basis |  |  |  |
Fair value |  |  |  |
Equity securities with readily determinable fair value | ¥ 2,589,000 | ¥ 3,903,000 |  |
Available-for-sale debt securities | 220,000 | 220,000 |  |
Retirement benefit obligation | 5,000 | 6,000 |  |
Carrying value | Non-recurring basis |  |  |  |
Fair value |  |  |  |
Long-term investments | 63,000 | 92,000 | ¥ 10,000 |
Operating lease right-of-use assets | 136,000 | 210,000 | 0 |
Goodwill | 0 | 2,768,000 | 0 |
Carrying value | Non-recurring basis | Leased hotels |  |  |  |
Fair value |  |  |  |
Property and equipment | ¥ 57,000 | ¥ 43,000 | ¥ 3,000 |

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