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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Fair value (Details) ¥ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CNY (¥) USD ($) | Dec. 31, 2018 CNY (¥) USD ($) | Dec. 31, 2020 USD ($)
Fair value |  |  |  |  |
Equity securities with readily determinable fair value | ¥ 3,903 |  | ¥ 2,908 |  | $ 598,000,000
Retirement benefit obligation | 179 |  |  |  | 27,000,000
Property and equipment - Total Loss for the Year | 180 |  | 3 | ¥ 35 |
Operating lease right-of-use assets | 28,980 |  | 20,875 |  | 4,441,000,000
Goodwill | 4,988 |  | 2,657 | 2,630 | $ 764,000,000
Goodwill, Impairment Loss | 437 | $ 67,000,000 | 0 | 0 |
Property and equipment, impairment loss | 41 |  | 3 | 35 |
Impairment loss of investment | 92 |  | 10 | 0 |
Operating lease right-of-use assets | 139 |  |  |  |
Long-lived asset impairment loss | 180 |  | 3 | 35 |
Operating Lease, Impairment Loss | 139 |  | 0 | 0 |
Leased hotels |  |  |  |  |
Fair value |  |  |  |  |
Property and equipment - Total Loss for the Year |  |  | 3 | 35 |
Property and equipment, impairment loss | 41 |  |  |  |
Long-lived asset impairment loss |  |  | 3 | 35 |
Convertible senior notes |  |  |  |  |
Fair value |  |  |  |  |
Long-term bank borrowings, current portion |  |  | 3,290 |  |
Carrying amounts of convertible senior notes | 6,318 |  | 3,290 | 3,209 |
Fair value of convertible senior notes | 7,747 |  | 3,711 | 3,185 |
Recurring basis | Level 1 |  |  |  |  |
Fair value |  |  |  |  |
Equity securities with readily determinable fair value | 3,903 |  | 2,908 |  |
Retirement benefit obligation | 6 |  |  |  |
Recurring basis | Significant Other Observable Inputs (Level 2) |  |  |  |  |
Fair value |  |  |  |  |
Available-for-sale debt securities | 220 |  | ¥ 220 |  |
Non-recurring basis |  |  |  |  |
Fair value |  |  |  |  |
Property and equipment | 2 |  |  | 10 |
Operating lease right-of-use assets | 71 |  |  |  |
Goodwill | 2,328 |  |  |  |
Non-recurring basis | Significant Unobservable Inputs (Level 3) |  |  |  |  |
Fair value |  |  |  |  |
Property and equipment | 2 |  |  | ¥ 10 |
Operating lease right-of-use assets | 71 |  |  |  |
Goodwill | ¥ 2,328 |  |  |  |
Revenue growth rate | Minimum |  |  |  |  |
Fair value |  |  |  |  |
Measurement input | $ |  |  | (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
Fair value | Recurring basis |  |  |  |  |
Fair value |  |  |  |  |
Equity securities with readily determinable fair value | ¥ 3,903 |  | ¥ 2,908 |  |
Available-for-sale debt securities | 220 |  | 220 |  |
Retirement benefit obligation | 6 |  |  |  |
Carrying value | Non-recurring basis |  |  |  |  |
Fair value |  |  |  |  |
Long-term investments | 92 |  | 10 | ¥ 0 |
Operating lease right-of-use assets | 210 |  | 0 | 0 |
Goodwill | 2,768 |  | 0 | 0 |
Carrying value | Non-recurring basis | Leased hotels |  |  |  |  |
Fair value |  |  |  |  |
Property and equipment | ¥ 43 |  | ¥ 3 | ¥ 45 |

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