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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Share-based compensation and Treasury shares (Details) ¥ in Millions	12 Months Ended
	Dec. 31, 2020 CNY (¥) segment shares	Dec. 31, 2019 CNY (¥) shares	Dec. 31, 2018 CNY (¥)
Share-based compensation
Recognized share-based compensation expenses	¥ 122	¥ 110	¥ 83
Number of operating segments | segment	2
Treasury shares
Repurchase of ordinary shares (in shares) | shares	3,096,764	3,096,764
Cash consideration paid for ordinary shares repurchased	¥ 107
Hotel operating costs
Share-based compensation
Recognized share-based compensation expenses	42	¥ 35	27
Selling and marketing expenses
Share-based compensation
Recognized share-based compensation expenses	4	3	3
General and administrative expenses
Share-based compensation
Recognized share-based compensation expenses	¥ 76	¥ 72	¥ 53

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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The cash outflow to reacquire common stock during the period.

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Number of previously issued common shares repurchased by the issuing entity and held in treasury.

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