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Summary Of Estimated Fair Value Of Available-For-Sale Debt Investments (Detail) ¥ in Millions, $ in Millions	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CNY (¥)
Investments, Debt and Equity Securities [Abstract]
Due in 1 year	¥ 505	$ 73
Due in 1 year through 5 years	10	1
Due in 5 year through 10 years	1,486	213
Not due at a single maturity date	1,969	283	¥ 1,167
Total	¥ 3,970	$ 570	¥ 1,167

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Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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