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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) |  |  |

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