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Computation of Basic and Diluted Net Income Attributable to Baidu, Inc. Per Share for Class A and Class B Ordinary Shares (Detail) ¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2016 CNY (¥) ¥ / shares shares	Dec. 31, 2015 CNY (¥) ¥ / shares shares	Dec. 31, 2014 CNY (¥) ¥ / shares shares
Numerator
Allocation of net income attributable to Baidu, Inc.	$ 1,595,038	¥ 11,074,351	¥ 33,334,993	¥ 13,144,249
Class A Ordinary Shares
Numerator
Allocation of net income attributable to Baidu, Inc.	$ 1,254,487	¥ 8,709,905	¥ 26,182,538	¥ 10,328,517
Denominator
Denominator used for earnings per share - basic	27,263,984	27,263,984	27,428,861	27,551,463
Earnings per share - basic | (per share)	$ 46.01	¥ 319.47	¥ 954.56	¥ 374.88
Numerator
Allocation of net income attributable to Baidu, Inc. for diluted computation	$ 1,255,388	¥ 8,716,163	¥ 26,205,544	¥ 10,339,397
Reallocation of net income attributable to Baidu, Inc. as a result of conversion of Class B to Class A shares	339,650	2,358,188	7,129,449	2,804,852
Allocation of net income attributable to Baidu, Inc.	$ 1,595,038	¥ 11,074,351	¥ 33,334,993	¥ 13,144,249
Denominator
Weighted average ordinary shares outstanding	27,263,984	27,263,984	27,428,861	27,551,463
Conversion of Class B to Class A ordinary shares	7,401,254	7,401,254	7,492,921	7,511,003
Share-based awards	91,848	91,848	112,688	136,008
Denominator used for earnings per share - diluted	34,757,086	34,757,086	35,034,470	35,198,474
Earnings per share - diluted | (per share)	$ 45.89	¥ 318.62	¥ 951.49	¥ 373.43
Class B Ordinary Shares
Numerator
Allocation of net income attributable to Baidu, Inc.	$ 340,551	¥ 2,364,446	¥ 7,152,455	¥ 2,815,732
Denominator
Denominator used for earnings per share - basic	7,401,254	7,401,254	7,492,921	7,511,003
Earnings per share - basic | (per share)	$ 46.01	¥ 319.47	¥ 954.56	¥ 374.88
Numerator
Allocation of net income attributable to Baidu, Inc. for diluted computation	$ 339,650	¥ 2,358,188	¥ 7,129,449	¥ 2,804,852
Reallocation of net income attributable to Baidu, Inc. as a result of conversion of Class B to Class A shares	0	0	0	0
Allocation of net income attributable to Baidu, Inc.	$ 339,650	¥ 2,358,188	¥ 7,129,449	¥ 2,804,852
Denominator
Weighted average ordinary shares outstanding	7,401,254	7,401,254	7,492,921	7,511,003
Conversion of Class B to Class A ordinary shares	0	0	0	0
Share-based awards	0	0	0	0
Denominator used for earnings per share - diluted	7,401,254	7,401,254	7,492,921	7,511,003
Earnings per share - diluted | (per share)	$ 45.89	¥ 318.62	¥ 951.49	¥ 373.43
American Depositary Shares | Class A Ordinary Shares
Denominator
Denominator used for earnings per share - basic	272,639,840	272,639,840	274,288,610	275,514,630
Earnings per share - basic | (per share)	$ 4.60	¥ 31.95	¥ 95.46	¥ 37.49
Denominator
Weighted average ordinary shares outstanding	272,639,840	272,639,840	274,288,610	275,514,630
Denominator used for earnings per share - diluted	347,570,860	347,570,860	350,344,700	351,984,740
Earnings per share - diluted | (per share)	$ 4.59	¥ 31.86	¥ 95.15	¥ 37.34

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Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise of dilutive convertible securities excluding adjustments related to ESOP convertible preferred stock, stock options, and restrictive stock units.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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The earnings that is allocated to common stock and participating securities to the extent that each security may share in earnings as if all of the earnings for the period had been distributed.

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