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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