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Restricted Net Assets - Additional Information (Detail) ¥ in Billions, $ in Billions	Jun. 30, 2020 CNY (¥)	Jun. 30, 2020 USD ($)	Dec. 31, 2019 CNY (¥)
Stockholders' Equity Note [Abstract]
Amounts of restricted paid up capital and statutory reserve funds of PRC subsidiaries and net assets of VIEs	¥ 49.5	$ 7.0	¥ 40.8

X

- Definition

Amount of restricted paid up capital and statutory reserve funds of PRC subsidiaries and net assets of VIEs as of the end of the most recently completed fiscal year.

+ References

No definition available.

+ Details

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Namespace Prefix:	bidu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_StockholdersEquityNoteAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration