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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Segment and geography information (Details)
¥ in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2020
CNY (¥)
Dec. 31, 2020
CNY (¥)
segment
Dec. 31, 2020
USD ($)
segment
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Segment Reporting, Revenue Reconciling Item [Line Items]          
Number of operating segments | segment   2 2    
Number of reportable segments | segment   2 2    
Total revenues   ¥ 10,196 $ 1,563 ¥ 11,212 ¥ 10,063
Operating costs and expenses   11,925 1,827 9,236 7,945
Goodwill impairment loss   437 67 0 0
Other operating income, net   480 74 132 226
Interest income   119 18 160 148
Interest expense   533 82 315 244
Other (expenses) income, net   (89) (14) 331 203
Unrealized (loss) gain from fair value changes of equity securities   (265) (42) 316 (914)
Foreign exchange gain (loss)   175 27 (35) (144)
Income (loss) before income taxes   (2,279) (350) 2,565 1,393
Income tax expense (benefit)   (215) (33) 640 569
(Loss) income from equity method investments   (140) (21) (164) (97)
Net loss attributable to noncontrolling interest   (12) (2) (8) 11
Net income (loss) attributable to Huazhu Group Limited   (2,192) (336) 1,769 716
Income tax expense (benefit)   (215) (33) 640 569
Interest expense   533 82 315 244
Depreciation and amortization   1,362 $ 208 ¥ 991 ¥ 891
EBITDA (Non-GAAP)   (631)      
legacy Huazhu          
Segment Reporting, Revenue Reconciling Item [Line Items]          
Total revenues   8,664      
Operating costs and expenses   8,978      
Other operating income, net   214      
Interest income   118      
Interest expense   427      
Other (expenses) income, net   (92)      
Unrealized (loss) gain from fair value changes of equity securities   (266)      
Foreign exchange gain (loss)   176      
Income (loss) before income taxes   (591)      
Income tax expense (benefit)   151      
(Loss) income from equity method investments   (117)      
Net loss attributable to noncontrolling interest   (12)      
Net income (loss) attributable to Huazhu Group Limited   (847)      
Income tax expense (benefit)   151      
Interest expense   427      
Depreciation and amortization   1,123      
EBITDA (Non-GAAP)   736      
legacy DH          
Segment Reporting, Revenue Reconciling Item [Line Items]          
Total revenues   1,532      
Operating costs and expenses   2,947      
Goodwill impairment loss ¥ 437 437      
Other operating income, net   266      
Interest income   1      
Interest expense   106      
Other (expenses) income, net   3      
Unrealized (loss) gain from fair value changes of equity securities   1      
Foreign exchange gain (loss)   (1)      
Income (loss) before income taxes   (1,688)      
Income tax expense (benefit)   (366)      
(Loss) income from equity method investments   (23)      
Net income (loss) attributable to Huazhu Group Limited   (1,345)      
Income tax expense (benefit)   (366)      
Interest expense   106      
Depreciation and amortization   239      
EBITDA (Non-GAAP)   ¥ (1,367)