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Shareholders' Equity (Detail) ¥ in Millions, $ in Millions	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CNY (¥)
Cumulative Effect on Retained Earnings, Net of Tax [Abstract]
PRC statutory reserve funds	¥ 626	$ 90	¥ 515
Unreserved retained earnings	125,642	18,047	128,731
Total retained earnings	¥ 126,268	$ 18,137	¥ 129,246

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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A segregation of retained earnings which is unavailable for dividend distribution. Includes also retained earnings appropriated for loss contingencies.

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A segregation of retained earnings which is available for dividend distribution. Earnings not paid out as dividends but instead reinvested in the core business or used to pay off debt. Unappropriated profit is part of shareholder equity. Also called cumulative distributions or earned surplus or accumulated earnings or unappropriated profit.

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