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Summary Of Estimated Fair Value Of Available-For-Sale Debt Investments (Detail) ¥ in Millions, $ in Millions	Jun. 30, 2020 CNY (¥)	Jun. 30, 2020 USD ($)	Dec. 31, 2019 CNY (¥)
Investments Debt Securities [Abstract]
Due in 1 year			¥ 505
Due in 1 year through 5 years	¥ 1,550	$ 220	10
Due in 5 year through 10 years			1,486
Not due at a single maturity date	2,051	290	1,969
Total	¥ 3,601	$ 510	¥ 3,970

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Investments, Debt Securities [Abstract].

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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 current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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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 second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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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 next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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