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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Investments, Loan receivables and Inventories (Details) - CNY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Investments |  |  |
Impairment loss | ¥ 92 | ¥ 10 | ¥ 0
Inventories |  |  |
Estimated useful life of small appliances and bedding | 1 year |  |
Minimum | Certain franchisees |  |  |
Loan receivables |  |  |
Term of loan agreement | 2 years |  |
Interest rate (as a percent) | 8.00% |  |
Minimum | Un-related third-parties |  |  |
Loan receivables |  |  |
Interest rate (as a percent) | 4.80% |  |
Maximum | Certain franchisees |  |  |
Loan receivables |  |  |
Term of loan agreement | 3 years |  |
Interest rate (as a percent) | 8.50% |  |
Maximum | Un-related third-parties |  |  |
Loan receivables |  |  |
Interest rate (as a percent) | 15.00% |  |

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