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Goodwill and Intangible Assets - Additional Information (Detail) ¥ in Millions, $ in Millions |  |  |  | 12 Months Ended
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Dec. 31, 2017 Unit | Dec. 31, 2016 Unit | Dec. 31, 2015 Unit | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥)
Amortization Of Intangible Assets Disclosure [Abstract] |  |  |  |  |  |  |
Number of reporting units the company | 2 | 3 | 3 |  |  |  |
Impairment loss on intangible assets |  |  |  | $ 81 | ¥ 529 | ¥ 213 | ¥ 0
Amortization expense of intangible assets |  |  |  | $ 1,200 | ¥ 7,900 | ¥ 4,700 | ¥ 2,500

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- Definition Amortization Of Intangible Assets Disclosure [Abstract] + References No definition available. + Details
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- Definition The number of reporting units the company split Baidu reporting unit into. + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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