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Shareholders' Equity (Detail) ¥ in Millions, $ in Millions | Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CNY (¥)
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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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