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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Earnings (losses) per share, Segment and geography information (Details) ¥ in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 CNY (¥) | Dec. 31, 2021 CNY (¥) segment | Dec. 31, 2021 USD ($) segment | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥)
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |
Number of operating segments | segment |  | 2 | 2 |  |
Number of reportable segments | segment |  | 2 | 2 |  |
Total revenues |  | ¥ 12,785 | $ 2,006 | ¥ 10,196 | ¥ 11,212
Operating costs and expenses |  | 13,607 | 2,135 | 11,925 | 9,236
Goodwill impairment loss |  | 0 |  | 437 | 0
Other operating income, net |  | 986 | 155 | 480 | 132
Interest income |  | 89 | 14 | 119 | 160
Interest expense |  | 405 | 64 | 533 | 315
Other income (expense), net |  | 157 | 25 | (89) | 331
Unrealized loss from fair value changes of equity securities |  | (96) | (15) | (265) | 316
Foreign exchange gain (loss) |  | (317) | (50) | 175 | (35)
Income (loss) before income taxes |  | (408) | (64) | (2,279) | 2,565
Income tax expense (benefit) |  | 12 | 2 | (215) | 640
Loss from equity method investments |  | (60) | (9) | (140) | (164)
Net loss attributable to noncontrolling interest |  | (15) | (2) | (12) | (8)
Net income (loss) attributable to Huazhu Group Limited |  | (465) | (73) | (2,192) | 1,769
Income tax expense (benefit) |  | 12 | 2 | (215) | 640
Interest expense |  | 405 | 64 | 533 | 315
Depreciation and amortization |  | 1,503 | $ 236 | 1,362 | ¥ 991
EBITDA |  | 1,366 |  | (631) |
Legacy Huazhu [Member] |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |
Total revenues |  | 11,247 |  | 8,664 |
Operating costs and expenses |  | 10,549 |  | 8,978 |
Other operating income, net |  | 193 |  | 214 |
Interest income |  | 88 |  | 118 |
Interest expense |  | 291 |  | 427 |
Other income (expense), net |  | 139 |  | (92) |
Unrealized loss from fair value changes of equity securities |  | (96) |  | (266) |
Foreign exchange gain (loss) |  | (294) |  | 176 |
Income (loss) before income taxes |  | 437 |  | (591) |
Income tax expense (benefit) |  | 249 |  | 151 |
Loss from equity method investments |  | (50) |  | (117) |
Net loss attributable to noncontrolling interest |  | (15) |  | (12) |
Net income (loss) attributable to Huazhu Group Limited |  | 153 |  | (847) |
Income tax expense (benefit) |  | 249 |  | 151 |
Interest expense |  | 291 |  | 427 |
Depreciation and amortization |  | 1,222 |  | 1,123 |
EBITDA |  | 1,827 |  | 736 |
Legacy DH [member] |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |
Total revenues |  | 1,538 |  | 1,532 |
Operating costs and expenses |  | 3,058 |  | 2,947 |
Goodwill impairment loss | ¥ 437 |  |  | 437 |
Other operating income, net |  | 793 |  | 266 |
Interest income |  | 1 |  | 1 |
Interest expense |  | 114 |  | 106 |
Other income (expense), net |  | 18 |  | 3 |
Unrealized loss from fair value changes of equity securities |  |  |  | 1 |
Foreign exchange gain (loss) |  | (23) |  | (1) |
Income (loss) before income taxes |  | (845) |  | (1,688) |
Income tax expense (benefit) |  | (237) |  | (366) |
Loss from equity method investments |  | (10) |  | (23) |
Net income (loss) attributable to Huazhu Group Limited |  | (618) |  | (1,345) |
Income tax expense (benefit) |  | (237) |  | (366) |
Interest expense |  | 114 |  | 106 |
Depreciation and amortization |  | 281 |  | 239 |
EBITDA |  | ¥ (461) |  | ¥ (1,367) |

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