Employee Defined Combination Plan - Additional Information (Detail) $ in Millions, ¥ in Billions	12 Months Ended
Dec. 31, 2024 CNY (¥)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 CNY (¥)	Dec. 31, 2022 CNY (¥)
Retirement Benefits [Abstract]
Amounts incurred for employee defined contribution plan	¥ 4.5	$ 613	¥ 4.6	¥ 4.3

Full time employees of the Group in the PRC participate in a government mandated multi-employer defined contribution plan pursuant to which certain pension benefits, medical care, unemployment insurance, employee housing fund and other welfare benefits are provided to employees.The line item represents the total amounts expensed as incurred for such employee defined contribution plan.

No definition available.

Name:	bidu_EmployeeDefinedContributionPlanAmountsExpensed
Namespace Prefix:	bidu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration